研究者詳細 - 紺谷　浩

論文 - 紺谷　浩

分割表示 260 件中 121 - 140 件目／全件表示 >>

Structure of neutron-scattering peaks in both s(++)-wave and s(+/-)-wave states of an iron pnictide superconductor Open Access

Onari Seiichiro, Kontani Hiroshi, Sato Masatoshi

PHYSICAL REVIEW B 81 巻 ( 6 ) 2010年2月

Origin of the anomalous Hall effect in the overdoped n-type superconductor Pr(2-x)Ce(x)Cuo(4): Current-vertex corrections due to antiferromagnetic fluctuations Open Access

Jenkins G. S., Schmadel D. C., Bach P. L., Greene R. L., Bechamp-Laganiere X., Roberge G., Fournier P., Kontani Hiroshi, Drew H. D.

PHYSICAL REVIEW B 81 巻 ( 2 ) 2010年1月

Violation of Anderson's Theorem for the Sign-Reversing s-Wave State of Iron-Pnictide Superconductors Open Access

Onari Seiichiro, Kontani Hiroshi

PHYSICAL REVIEW LETTERS 103 巻 ( 17 ) 2009年10月

*Violation of Anderson's Theorem for the Sign-Reversing s-Wave State of Iron-Pnictide Superconductors 招待有り査読有り Open Access

Seiichiro Onari and Hiroshi Kontani

Physical Review Letters 103 巻頁： 177001 2009年10月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Based on the five-orbital model, we study the effect of local impurity in iron pnictides, and find that the interband impurity scattering is promoted by the d-orbital degree of freedom. This fact means that the fully gapped sign-reversing s-wave state, which is predicted by spin fluctuation theories, is very fragile against impurities. In the BCS theory, only 1% impurities with intermediate strength induce huge pair breaking, resulting in the large in-gap state and prominent reduction in Tc, contrary to the prediction based on simple orbital-less models. The present study provides a stringent constraint on the pairing symmetry and the electronic states in iron pnictides.

DOI： 10.1103/PhysRevLett.103.177001

Anomalous Hall effect in the t2g orbital kagome lattice due to noncollinearity: Significance of the orbital Aharonov-Bohm effect 査読有り Open Access

Takeshi Tomizawa and Hiroshi Kontani

Physical Review B 80 巻頁： 100401 2009年9月

記述言語：英語掲載種別：研究論文（学術雑誌）

A mechanism of spin structure-driven anomalous Hall effect (AHE) in tilted ferromagnetic metals is proposed by taking account of the d-orbital degree of freedom. We find that a conduction electron acquires a Berry phase due to the complex d-orbital wave function, in the presence of noncollinear spin structure and the spin-orbit interaction. The AHE driven by this orbital-derived Berry phase is much larger than the AHE induced by spin chirality, and it naturally explains the salient features of spin structure-driven AHE in pyrochlore Nd2Mo2O7. Since the proposed AHE can occur even for coplanar spin orders (Mz=0), it is expected to emerge in other interesting geometrically frustrated systems.

DOI： 10.1103/PhysRevB.80.100401

Anomalous Hall effect in the t2g orbital kagome lattice due to noncollinearity: Significance of the orbital Aharonov-Bohm effect Open Access

Tomizawa Takeshi, Kontani Hiroshi

PHYSICAL REVIEW B 80 巻 ( 10 ) 2009年9月

Anomalous and spin Hall effects in magnetic granular films

Inoue Jun-ichiro, Tanaka Takuro, Kontani Hiroshi

PHYSICAL REVIEW B 80 巻 ( 2 ) 2009年7月

Impurity-induced in-gap state and T-c in sign-reversing s-wave superconductors: analysis of iron oxypnictide superconductors Open Access

Senga Yuko, Kontani Hiroshi

NEW JOURNAL OF PHYSICS 11 巻 2009年3月

Unconventional Pairing Originating from the Disconnected Fermi Surfaces of Superconducting LaFeAsO1-xFx (vol 101, 087004, 2008) Open Access

Kuroki Kazuhiko, Onari Seiichiro, Arita Ryotaro, Usui Hidetomo, Tanaka Yukio, Kontani Hiroshi, Aoki Hideo

PHYSICAL REVIEW LETTERS 102 巻 ( 10 ) 2009年3月

Unconventional pairing originating from disconnected Fermi surfaces in the iron-based superconductor Open Access

Kuroki Kazuhiko, Onari Seiichiro, Arita Ryotaro, Usui Hidetomo, Tanaka Yukio, Kontani Hiroshi, Aoki Hideo

NEW JOURNAL OF PHYSICS 11 巻 2009年2月

Intrinsic Spin Hall Effect in the s-Wave Superconducting State: Analysis of the Rashba Model Open Access

Kontani H., Goryo J., Hirashima D. S.

PHYSICAL REVIEW LETTERS 102 巻 ( 8 ) 2009年2月

Intrinsic Spin Hall Effect in the s-Wave Superconducting State: Analysis of the Rashba Model 査読有り Open Access

H. Kontani, J. Goryo, and D. S. Hirashima

Physical Review Letters 102 巻頁： 086602 2009年2月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

A general expression for spin Hall conductivity (SHC) in the s-wave superconducting state at finite temperatures is derived. Based on the expression, we study SHC in a two-dimensional electron gas model in the presence of Rashba spin-orbit interaction (SOI). SHC is zero in the normal state, whereas it takes a large negative value as soon as the superconductivity occurs, due to the change in the quasiparticle contributions. Since this remarkable behavior is independent of the strength of the SOI, it will be widely observed in thin films of superconductors with surface-induced Rashba SOI, or in various noncentrosymmetric superconductors.

DOI： 10.1103/PhysRevLett.102.086602

Giant extrinsic spin Hall effect due to rare-earth impurities Open Access

Tanaka T., Kontani H.

NEW JOURNAL OF PHYSICS 11 巻 2009年1月

Giant Orbital Hall Effect in Transition Metals: Origin of Large Spin and Anomalous Hall Effects Open Access

Kontani H., Tanaka T., Hirashima D. S., Yamada K., Inoue J.

PHYSICAL REVIEW LETTERS 102 巻 ( 1 ) 2009年1月

*Giant Orbital Hall Effect in Transition Metals: Origin of Large Spin and Anomalous Hall Effects 招待有り査読有り Open Access

102 巻頁： 016601 2009年1月

Minimal model for study on Superconductivity in LaFeAsO1-xFx based on ab-initio downfolding Open Access

Arita Ryotaro, Onari Seiichiro, Usui Hidetomo, Kuroki Kazuhiko, Tanaka Yukio, Kontani Hiroshi, Aoki Hideo

25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 5 150 巻 2009年

Non-Fermi liquid behavior in the magnetotransport of quasi two-dimensional heavy Fermion compounds CeMIn5

Nakajima Y., Shibauchi T., Shishido H., Nakai H., Behnia K., Izawa K., Hedo M., Uwatoko Y., Matsumoto T., Settai R., Onuki Y., Kontani H., Matsuda Y.

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 69 巻 ( 12 ) 頁： 3261 - 3264 2008年12月

Spin Hall effect in Sr2RuO4 and transition metals (Nb,Ta) Open Access

Tanaka T., Kontani H., Naito M., Hirashima D. S., Yamada K., Inoue J.

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 69 巻 ( 12 ) 頁： 3250-3252 2008年12月

Impurity Effects in Sign-Reversing Fully Gapped Superconductors: Analysis of FeAs Superconductors Open Access

Senga Yuko, Kontani Hiroshi

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 巻 ( 11 ) 2008年11月

Unconventional superconductivity originating from disconnected Fermi surfaces in the iron-based oxypnictide

Kuroki Kazuhiko, Onari Seiichiro, Arita Ryotaro, Usui Hidetomo, Tanaka Yukio, Kontani Hiroshi, Aoki Hideo

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 巻頁： 96-98 2008年11月

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