Faculty Profiles - YAMAKAWA Youichi

Papers - YAMAKAWA Youichi

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Drastic magnetic-field-induced chiral current order and emergent current-bond-field interplay in kagome metals Reviewed International journal

Rina Tazai, Youichi Yamakawa, Hiroshi Kontani

Proceedings of the National Academy of Sciences USA Vol. 121 ( 3 ) page： e2303476121-1 - e2303476121-10 2024.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Proceedings of the National Academy of Sciences

In kagome metals, the chiral current order parameter
η with time-reversal-symmetry-breaking is the source of various exotic electronic states, while the method of controlling the current order and its interplay with the star-of-David bond order ϕ are still unsolved. Here, we reveal that tiny uniform orbital magnetization Morb[η,ϕ] is induced by the chiral current order, and its magnitude is prominently enlarged under the presence of the bond order. Importantly, we derive the magnetic-field (hz)-induced Ginzburg–Landau (GL) free energy expression ΔF[hz,η,ϕ]∝−hzMorb[η,ϕ], which enables us to elucidate the field-induced current-bond phase transitions in kagome metals. The emergent current-bond-
hz trilinear coupling term in the free energy, −m1hzη·ϕ, naturally explains the characteristic magnetic-field sensitive electronic states in kagome metals, such as the field-induced current order and the strong interplay between the bond and current orders. The GL coefficients of ΔF[hz,η,ϕ] derived from the realistic multiorbital model are appropriate to explain various experiments. Furthermore, we discuss the field-induced loop current orders in the square lattice models that have been studied in cuprate superconductors.

DOI： 10.1073/pnas.2303476121

Charge-loop current order and Z3 nematicity mediated by bond order fluctuations in kagome metals Reviewed International journal

Rina Tazai, Youichi Yamakawa, Hiroshi Kontani

Nature Communications Vol. 14 page： 7845-1 - 7845-9 2023.11

Language：English Publishing type：Research paper (scientific journal)

Recent experiments on geometrically frustrated kagome metal AV3Sb5 (A = K, Rb, Cs) have revealed the emergence of the charge loop current (cLC) order near the bond order (BO) phase. However, the origin of the cLC and its interplay with other phases have been uncovered. Here, we propose a novel mechanism of the cLC state, by focusing on the BO phase common in kagome metals. The BO fluctuations in kagome metals, which emerges due to the Coulomb interaction and the electron-phonon coupling, mediate the odd-parity particle-hole condensation that gives rise to the topological current order. Furthermore, the predicted cLC+BO phase gives rise to the Z3-nematic state in addition to the giant anomalous Hall effect. The present theory predicts the close relationship between the cLC, the BO, and the nematicity, which is significant to understand the cascade of quantum electron states in kagome metals. The present scenario provides a natural understanding.

DOI： 10.1038/s41467-023-42952-6

Mechanism of exotic density-wave and beyond-Migdal unconventional superconductivity in kagome metal AV(3)Sb(5) (A = K, Rb, Cs) Reviewed International journal

Tazai Rina, Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

SCIENCE ADVANCES Vol. 8 ( 13 ) page： eabl4108-1 - eabl4108-9 2022.4

Odd-parity spin-loop-current order mediated by transverse spin fluctuations in cuprates and related electron systems Reviewed International journal

H. Kontani, Y. Yamakawa, R. Tazai, and S. Onari

Physical Review Research Vol. 3 ( 1 ) page： 013127-1 - 013127-13 2021.2

Language：Japanese Publishing type：Research paper (scientific journal) Publisher： American Physical Society

Unconventional symmetry-breaking phenomena due to nontrivial order parameters attract increasing attention in strongly correlated electron systems. Here, we predict theoretically the occurrence of nanoscale spontaneous spin current, called the spin-loop-current (sLC) order, as a promising origin of the pseudogap and electronic nematicity in cuprates. We reveal that the sLC is driven by the odd-parity electron-hole condensations that are mediated by transverse spin fluctuations around the pseudogap temperature T∗. At the same temperature, odd-parity magnon pair condensation occurs. The sLC order is “hidden” in that neither internal magnetic field nor charge-density modulation is induced, whereas the predicted sLC with finite wave-number naturally gives the Fermi arc structure. In addition, the fluctuations of sLC order work as attractive pairing interaction between adjacent hot spots, which enlarges the d-wave superconducting transition temperature Tc. The sLC state will be a key ingredient in understanding the pseudogap, electronic nematicity, as well as superconductivity in cuprates and other strongly correlated metals.

DOI： 10.1103/PhysRevResearch.3.013127

Web of Science

Nematicity and Magnetism in FeSe and Other Families of Fe-Based Superconductors Reviewed International journal

Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

PHYSICAL REVIEW X Vol. 6 ( 2 ) page： 021032-1 - 021032-15 2016.6

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Nematicity and magnetism are two key features in Fe-based superconductors, and their interplay is one of the most important unsolved problems. In FeSe, the magnetic order is absent below the structural transition temperature Tstr=90 K, in stark contrast to the fact that the magnetism emerges slightly below Tstr in other families. To understand such amazing material dependence, we investigate the spin-fluctuation-mediated orbital order (nxz≠nyz) by focusing on the orbital-spin interplay driven by the strong-coupling effect, called the vertex correction. This orbital-spin interplay is very strong in FeSe because of the small ratio between the Hund’s and Coulomb interactions (J¯/U¯) and large dxz, dyz-orbital weight at the Fermi level. For this reason, in the FeSe model, the orbital order is established irrespective of the fact that the spin fluctuations are very weak, so the magnetism is absent below Tstr. In contrast, in the LaFeAsO model, the magnetic order appears just below Tstr both experimentally and theoretically. Thus, the orbital-spin interplay due to the vertex correction is the key ingredient in understanding the rich phase diagram with nematicity and magnetism in Fe-based superconductors in a unified way.

DOI： 10.1103/PhysRevX.6.021032

Web of Science

Sign-Reversing Orbital Polarization in the Nematic Phase of FeSe due to the C-2 Symmetry Breaking in the Self-Energy Reviewed

Onari Seiichiro, Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW LETTERS Vol. 116 ( 22 ) page： 227001-1 - 227001-6 2016.6

Odd-parity bond order and induced nonreciprocal transport in the kagome metal CsTi3Bi5 driven by quantum interference Reviewed International journal

J. Huang, Y. Yamakawa, R. Tazai, T. Morimoto, and H. Kontani

Physical Review B Vol. 111 page： 125153-1 - 125153-13 2025.3

Giant impurity effects on charge loop current order states in kagome metals Reviewed

S. Nakazawa, R. Tazai, Y. Yamakawa, S. Onari, and H. Kontani

Physical Review B Vol. 111 page： 075161-1 - 075161-10 2025.2

Real-Space Loop Current Pattern in Time-Reversal-Symmetry Breaking Phase in Kagome Metals Reviewed

Shimura, K; Tazai, R; Yamakawa, Y; Onari, S; Kontani, H

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 93 ( 3 ) page： 033704-1 - 033704-5 2024.3

Superconductivity in Ternary Zirconium Telluride Zr6MTe2 with 3d Transition Metals Reviewed

Matsumoto, H; Yamakawa, Y; Okuma, R; Nishio-Hamane, D; Okamoto, Y

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 93 ( 2 ) page： 023705-1 - 023705-5 2024.2

Superconductivity in Ternary Germanide ScPdGe and Silicide ScPdSi Reviewed

Shinoda, Y; Okamoto, Y; Yamakawa, Y; Takatsu, H; Kageyama, H; Hirai, D; Takenaka, K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 93 ( 2 ) page： 023701-1 - 023701-4 2024.2

Low temperature phase transitions inside the CDW phase in the kagome metals AV3Sb5 (A=Cs, Rb, K): Significance of mixed-type Fermi surface electron correlations Reviewed

Jianxin Huang, Rian Tazai, Youichi Yamakawa, Seiichiro Onari, and Hiroshi Kontani

Physical Review B Vol. 109 ( 4 ) page： L041110-1 - L041110-6 2024.1

Superconductivity in Ternary Scandium Telluride Sc6MTe2 with 3d, 4d, and 5d Transition Metals Reviewed

Shinoda, Y; Okamoto, Y; Yamakawa, Y; Matsumoto, H; Hirai, D; Takenaka, K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 92 ( 10 ) page： 103701-1 - 103701-5 2023.8

Rigorous formalism for unconventional symmetry breaking in Fermi liquid theory and its application to nematicity in FeSe

Tazai Rina, Matsubara Shun, Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 107 ( 3 ) 2023.1

Correlation-driven electronic nematicity in the Dirac semimetal BaNiS2 Reviewed

C. J. Butler, Y. Kohsaka, Y. Yamakawa, M. S. Bahramy, S. Onari, H. Kontani, T. Hanaguri, and S. Shamoto

Proceedings of the National Academy of Sciences Vol. 119 ( 49 ) page： e2212730119-1 - e2212730119-8 2022.12

d- and p-wave Quantum Liquid Crystal Orders in Cuprate Superconductors, Kappa-(BEDT-TTF)(2)X, and Coupled Chain Hubbard Models: Functional-renormalization-group Analysis

Tazai Rina, Yamakawa Youichi, Tsuchiizu Masahisa, Kontani Hiroshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 90 ( 11 ) 2021.11

Unconventional orbital charge density wave mechanism in the transition metal dichalcogenide 1T-TaS2 Reviewed

Hirata Toru, Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

Physical Review Research Vol. 3 ( 3 ) page： L032053-1 - L032053-6 2021.8

Pressure-induced reconstitution of Fermi surfaces and spin fluctuations in S-substituted FeSe

Kuwayama T., Matsuura K., Gouchi J., Yamakawa Y., Mizukami Y., Kasahara S., Matsuda Y., Shibauchi T., Kontani H., Uwatoko Y., Fujiwara N.

SCIENTIFIC REPORTS Vol. 11 ( 1 ) 2021.8

Unconventional Density Waves and Superconductivities in Fe-Based Superconductors and Other Strongly Correlated Electron Systems Invited Reviewed

H. Kontani, R. Tazai, Y. Yamakawa, and S. Onari

Advances in Physics Vol. 70 ( 3 ) page： 355 - 443 2021.7

Development of Spin Fluctuations under the Presence of d-wave Bond Order in Cuprate Superconductors Reviewed

Ando Satoshi, Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

Journal of the Physical Society of Japan Vol. 90 ( 6 ) page： 063704-1 - 063704-5 2021.6

Superconductivity in Nb2Pd3Te5 and Chemically-Doped Ta2Pd3Te5 Reviewed

Higashihara Naoya, Okamoto Yoshihiko, Yoshikawa Yuma, Yamakawa Youichi, Takatsu Hiroshi, Kageyama Hiroshi, Takenaka Koshi

Journal of the Physical Society of Japan Vol. 90 ( 6 ) page： 063705-1 - 063705-4 2021.6

Prediction of pseudogap formation due to d-wave bond-order in organic superconductor κ-(BEDT-TTF)2X Reviewed

Tazai Rina, Yamakawa Youichi, Tsuchiizu Masahisa, Kontani Hiroshi

Physical Review Research Vol. 3 ( 2 ) page： L022014-1 - L022014-6 2021.5

Emergence of charge loop current in the geometrically frustrated Hubbard model: A functional renormalization group study Reviewed

Tazai Rina, Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 103 ( 16 ) 2021.4

High-mobility carriers induced by chemical doping in the candidate nodal-line semimetal CaAgP

Okamoto Yoshihiko, Saigusa Kazushige, Wada Taichi, Yamakawa Youichi, Yamakage Ai, Sasagawa Takao, Katayama Naoyuki, Takatsu Hiroshi, Kageyama Hiroshi, Takenaka Koshi

PHYSICAL REVIEW B Vol. 102 ( 11 ) 2020.9

Doping effects on electronic states in electron-doped FeSe: Impact of self-energy and vertex corrections

Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 102 ( 8 ) 2020.8

Superconductivity in PtSbS with a Noncentrosymmetric Cubic Crystal Structure

Mizutani Ryosuke, Okamoto Yoshihiko, Nagaso Hayate, Yamakawa Youichi, Takatsu Hiroshi, Kageyama Hiroshi, Kittaka Shunichiro, Kono Yohei, Sakakibara Toshiro, Takenaka Koshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 88 ( 9 ) 2019.9

Pressure-induced quantum critical point in the heavily hydrogen-doped iron-based superconductor LaFeAsO

Takeuchi Masayoshi, Fujiwara Naoki, Kuwayama Takanori, Nakagawa Satoshi, Iimura Soshi, Matsuishi Satoru, Yamakawa Youichi, Kontani Hiroshi, Hosono Hideo

PHYSICAL REVIEW B Vol. 99 ( 17 ) 2019.5

Self-energy driven resonancelike inelastic neutron spectrum in the s(++)-wave state in Fe-based superconductors

Takeuchi Lisa, Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 98 ( 16 ) 2018.10

Pairing mechanism for nodal s-wave superconductivity in BaFe2(As, P)(2): Analysis beyond Migdal-Eliashberg formalism

Nakaoka Hironori, Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 98 ( 12 ) 2018.9

Edge-induced Strongly Correlated Electronic States in Two-dimensional Hubbard Model: Enhancement of Magnetic Correlations and Self-energy Effects

Matsubara Shun, Yamakawa Youichi, Kontani Hiroshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 87 ( 7 ) 2018.7

Large thermoelectric power factor in one-dimensional telluride Nb4SiTe4 and substituted compounds

Okamoto Yoshihiko, Wada Taichi, Yamakawa Youichi, Inohara Takumi, Takenaka Koshi

APPLIED PHYSICS LETTERS Vol. 112 ( 17 ) 2018.4

Multistage electronic nematic transitions in cuprate superconductors: A functional-renormalization-group analysis

Tsuchiizu Masahisa, Kawaguchi Kouki, Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 97 ( 16 ) 2018.4

Abrupt change of the superconducting gap structure at the nematic critical point in FeSe1-xSx Reviewed

Sato Yuki, Kasahara Shigeru, Taniguchi Tomoya, Xing Xiangzhuo, Kasahara Yuichi, Tokiwa Yoshifumi, Yamakawa Youichi, Kontani Hiroshi, Shibauchi Takasada, Matsuda Yuji

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Vol. 115 ( 6 ) page： 1227 - 1231 2018.2

Observation of Dirac-like energy band and ring-torus Fermi surface associated with the nodal line in topological insulator CaAgAs Reviewed

Takane Daichi, Nakayama Kosuke, Souma Seigo, Wada Taichi, Okamoto Yoshihiko, Takenaka Koshi, Yamakawa Youichi, Yamakage Ai, Mitsuhashi Taichi, Horiba Koji, Kumigashira Hiroshi, Takahashi Takashi, Sato Takafumi

NPJ QUANTUM MATERIALS Vol. 3 2018.1

Nematicity, magnetism, and superconductivity in FeSe under pressure: Unified explanation based on the self-consistent vertex correction theory Reviewed

Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 96 ( 14 ) 2017.10

Superconductivity without a hole pocket in electron-doped FeSe: Analysis beyond the Migdal-Eliashberg formalism Reviewed

Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 96 ( 4 ) 2017.7

Plain s-Wave Superconductivity near Magnetic Criticality: Enhancement of Attractive Electron-Boson Coupling Vertex Corrections Reviewed

Tazai Rina, Yamakawa Youichi, Tsuchiizu Masahisa, Kontani Hiroshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 86 ( 7 ) 2017.7

Crossing-line-node semimetals: General theory and application to rare-earth trihydrides Reviewed

Kobayashi Shingo, Yamakawa Youichi, Yamakage Ai, Inohara Takumi, Okamoto Yoshihiko, Tanaka Yukio

PHYSICAL REVIEW B Vol. 95 ( 24 ) 2017.6

Competing Unconventional Charge-Density-Wave States in Cuprate Superconductors: Spin-Fluctuation-Driven Mechanism Reviewed

Kawaguchi Kouki, Yamakawa Youichi, Tsuchiizu Masahisa, Kontani Hiroshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 86 ( 6 ) 2017.6

Large thermoelectric power factor at low temperatures in one-dimensional telluride Ta4SiTe4 Reviewed

Inohara Takumi, Okamoto Yoshihiko, Yamakawa Youichi, Yamakage Ai, Takenaka Koshi

APPLIED PHYSICS LETTERS Vol. 110 ( 18 ) 2017.5

Unusual nodal behaviors of the superconducting gap in the iron-based superconductor $\mathrm{Ba}(\mathrm{F}{\mathrm{e}}_{0.65}\mathrm{R}{\mathrm{u}}_{0.35}{)}_{2}\mathrm{A}{\mathrm{s}}_{2}$: Effects of spin-orbit coupling Reviewed

L. Liu, K. Okazaki, T. Yoshida, H. Suzuki, M. Horio, L. C. C. Ambolode, J. Xu, S. Ideta, M. Hashimoto, D. H. Lu, Z.-X. Shen, Y. Ota, S. Shin, M. Nakajima, S. Ishida, K. Kihou, C. H. Lee, A. Iyo, H. Eisaki, T. Mikami, T. Kakeshita, Y. Yamakawa, H. Kontani, S. Uchida, A. Fujimori

Vol. 95 ( 10 ) page： 104504 2017.3

Low Carrier Density Metal Realized in Candidate Line-Node Dirac Semimetals CaAgP and CaAgAs Reviewed

Okamoto Yoshihiko, Inohara Takumi, Yamakage Ai, Yamakawa Youichi, Takenaka Koshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 85 ( 12 ) 2016.12

Functional renormalization group study of orbital fluctuation mediated superconductivity: Impact of the electron-boson coupling vertex corrections Reviewed

Tazai Rina, Yamakawa Youichi, Tsuchiizu Masahisa, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 94 ( 11 ) 2016.9

Synthesis and Superconducting Properties of a Hexagonal Phosphide ScRhP Reviewed

Inohara Takumi, Okamoto Yoshihiko, Yamakawa Youichi, Takenaka Koshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 85 ( 9 ) 2016.9

Theoretical prediction of nematic orbital-ordered state in the Ti oxypnictide superconductor BaTi2(As,Sb)(2)O Reviewed

Nakaoka Hironori, Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 93 ( 24 ) 2016.6

p-orbital density wave with d symmetry in high-T-c cuprate superconductors predicted by renormalization-group plus constrained RPA theory Reviewed

Tsuchiizu Masahisa, Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 93 ( 15 ) 2016.4

Superconductivity in the Hexagonal Ternary Phosphide ScIrP Reviewed

Okamoto Yoshihiko, Inohara Takumi, Yamakawa Youichi, Yamakage Ai, Takenaka Koshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 85 ( 1 ) 2016.1

Line-Node Dirac Semimetal and Topological Insulating Phase in Noncentrosymmetric Pnictides CaAgX (X = P, As) Reviewed

Yamakage Ai, Yamakawa Youichi, Tanaka Yukio, Okamoto Yoshihiko

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 85 ( 1 ) 2016.1

Superconductivity pairing mechanism from cobalt impurity doping in FeSe: Spin (s±) or orbital (s++) fluctuation Reviewed

T. Urata, Y. Tanabe, K. K. Huynh, Y. Yamakawa, H. Kontani, K. Tanigaki

Physical Review B Vol. 93 ( 1 ) page： 014507 2016.1

Momentum-dependent sign inversion of orbital order in superconducting FeSe Reviewed

Y. Suzuki, T. Shimojima, T. Sonobe, A. Nakamura, M. Sakano, H. Tsuji, J. Omachi, K. Yoshioka, M. Kuwata-Gonokami, T. Watashige, R. Kobayashi, S. Kasahara, T. Shibauchi, Y. Matsuda, Y. Yamakawa, H. Kontani, K. Ishizaka

Physical Review B Vol. 92 ( 20 ) page： 205117 2015.11

Revisiting orbital-fluctuation-mediated superconductivity in LiFeAs: Nontrivial spin-orbit interaction effects on the band structure and superconducting gap function Reviewed

Saito Tetsuro, Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 92 ( 13 ) 2015.10

Quasiparticle interference in Fe-based superconductors based on a five-orbital tight-binding model Reviewed

Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 92 ( 4 ) 2015.7

Spin-Fluctuation-Driven Nematic Charge-Density Wave in Cuprate Superconductors: Impact of Aslamazov-Larkin Vertex Corrections Reviewed

Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW LETTERS Vol. 114 ( 25 ) page： 257001-1 - 257001-6 2015.6

Spin-triplet superconductivity in Sr2RuO4 due to orbital and spin fluctuations: Analyses by two-dimensional renormalization group theory and self-consistent vertex-correction method Reviewed

Tsuchiizu Masahisa, Yamakawa Youichi, Onari Seiichiro, Ohno Yusuke, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 91 ( 15 ) 2015.4

Quantum critical behavior in heavily doped LaFeAsO1-xHx pnictide superconductors analyzed using nuclear magnetic resonance Reviewed

R. Sakurai, N. Fujiwara, N. Kawaguchi, Y. Yamakawa, H. Kontani, S. Iimura, S. Matsuishi, H. Hosono

Physical Review B Vol. 91 ( 6 ) page： 064509 2015.2

Linear Response Theory for Shear Modulus C-66 and Raman Quadrupole Susceptibility: Evidence for Nematic Orbital Fluctuations in Fe-based Superconductors Reviewed

Kontani Hiroshi, Yamakawa Youichi

PHYSICAL REVIEW LETTERS Vol. 113 ( 4 ) 2014.7

Reproduction of experimental gap structure in LiFeAs based on orbital-spin fluctuation theory: s(++)-wave, s(+/-)-wave, and hole-s(+/-)-wave states Reviewed

Saito Tetsuro, Onari Seiichiro, Yamakawa Youichi, Kontani Hiroshi, Borisenko Sergey V., Zabolotnyy Volodymyr B.

PHYSICAL REVIEW B Vol. 90 ( 3 ) 2014.7

High-T-c Superconductivity near the Anion Height Instability in Fe-Based Superconductors: Analysis of LaFeAsO1-xHx Reviewed

Onari Seiichiro, Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW LETTERS Vol. 112 ( 18 ) 2014.5

Zigzag Chain Structure Transition and Orbital Fluctuations in Ni-Based Superconductors Reviewed

Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 82 ( 9 ) 2013.9

Detection of Antiferromagnetic Ordering in Heavily Doped LaFeAsO1-xHx Pnictide Superconductors Using Nuclear-Magnetic-Resonance Techniques Reviewed

N. Fujiwara, S. Tsutsumi, S. Iimura, S. Matsuishi, H. Hosono, Y. Yamakawa, H. Kontani

Physical Review Letters Vol. 111 ( 9 ) page： 097002 2013.8

Phase diagram and superconducting states in LaFeAsO1-xHx based on the multiorbital extended Hubbard model Reviewed

Y. Yamakawa, S. Onari, H. Kontani, N. Fujiwara, S. Iimura, H. Hosono

Physical Review B Vol. 88 ( 4 ) page： 041106(R) 2013.7

Effect of realistic finite-size impurities on T-c in Fe-based superconductors based on the five-orbital tight-binding model Reviewed

Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 87 ( 19 ) 2013.5

Effect of inelastic scattering on the nuclear magnetic relaxation rate 1/T1T in iron-based superconductors Reviewed

Yamakawa Youichi, Onari Seiichiro, Kontani Hiroshi

SUPERCONDUCTOR SCIENCE & TECHNOLOGY Vol. 25 ( 8 ) 2012.8

Impurity-induced electronic nematic state and C-2-symmetric nanostructures in iron pnictide superconductors Reviewed

Inoue Yoshio, Yamakawa Youichi, Kontani Hiroshi

PHYSICAL REVIEW B Vol. 85 ( 22 ) 2012.6

Orbital fluctuation theory in iron-based superconductors: s(++)-wave superconductivity, structure transition, and impurity-induced nematic order Reviewed

Kontani Hiroshi, Inoue Yoshio, Saito Tetsuro, Yamakawa Youichi, Onari Seiichiro

SOLID STATE COMMUNICATIONS Vol. 152 ( 8 ) page： 718-727 2012.4

Structural transition, ferro-orbital order and its fluctuation-mediated s(++)-wave superconductivity in iron pnictides Reviewed

Ono Yoshiaki, Yanagi Yuki, Adachi Naoko, Yamakawa Youichi

SOLID STATE COMMUNICATIONS Vol. 152 ( 8 ) page： 701-710 2012.4

Orbital Order, Structural Transition, and Superconductivity in Iron Pnictides Reviewed

Yanagi Yuki, Yamakawa Youichi, Adachi Naoko, Ono Yoshiaki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 79 ( 12 ) 2010.12

Cooperative effects of Coulomb and electron-phonon interactions in the two-dimensional 16-band d-p model for iron-based superconductors Reviewed

Yanagi Yuki, Yamakawa Youichi, Adachi Naoko, Ono Yoshiaki

PHYSICAL REVIEW B Vol. 82 ( 6 ) 2010.8

Two types of s-wave pairing due to magnetic and orbital fluctuations in the two-dimensional 16-band d-p model for iron-based superconductors Reviewed

Yanagi Yuki, Yamakawa Youichi, Ono Yoshiaki

PHYSICAL REVIEW B Vol. 81 ( 5 ) 2010.2

Antiferromagnetic, Charge and Orbital Order in Na0.5CoO2 Based on the Two Dimensional 11 Bands d-p Model Reviewed

Yamakawa Youichi, Watanabe Naohiro, Ono Yoshiaki

INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009) Vol. 200 2010

Effect of the spin-orbit interaction and the electron phonon coupling on the electronic state in a silicon vacancy Reviewed

Yamada Takemi, Yamakawa Youichi, Ono Yoshiaki

INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009) Vol. 200 2010

Structural Transition of Li2RuO3 Induced by Molecular-Orbit Formation Reviewed

Miura Yoko, Sato Masatoshi, Yamakawa Youichi, Habaguchi Tatsuro, Ono Yoshiaki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 78 ( 9 ) 2009.9

Quadrupole Susceptibility and Elastic Softening due to a Vacancy in Silicon Crystal Reviewed

Yamada Takemi, Yamakawa Youichi, Ono Yoshiaki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 78 ( 5 ) 2009.5

Cluster Model Calculations for Charge States of a Silicon Vacancy Reviewed

Yamakawa Youichi, Ono Yoshiaki

25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4 Vol. 150 2009

Magnetism and Superconductivity in the Two-Dimensional 16-Band d-p Model for Iron-Based Superconductors Reviewed

Yanagi Yuki, Yamakawa Youichi, Ono Yoshiaki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 77 ( 12 ) 2008.12

Antiferromagnetic, charge and orbital ordered states of Na0.5CoO2 based on the two-dimensional triangular lattice d-p model Reviewed

Yamakawa Youichi, Ono Yoshiaki

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS Vol. 69 ( 12 ) page： 3349-3351 2008.12

Electronic states and pairing symmetry in the two-dimensional 16 band d-p model for iron-based superconductor Reviewed

Yanagi Yuki, Yamakawa Youichi, Ono Yoshiaki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 77 page： 149-150 2008.11

Effects of Electron Correlation and Electron-phonon Coupling on the quantum state of a Silicon Vacancy Reviewed

Yamakawa Youichi, Mitsumoto Keisuke, Ono Yoshiaki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 77 page： 266-268 2008.1

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Papers - YAMAKAWA Youichi