Faculty Profiles - TANAKA, Yukio

Papers - TANAKA, Yukio

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Zero-bias Peak in Tunneling Spectra of High-Tc Superconductors and its Splitting Reviewed

Y. Asano, R. Sekiguchi, Y. Tanaka, S. Kashiwaya and H. Tsuchiura.

Physica C Vol. 412-414 page： 157-161 2004

Conductance in Normal-metal / PrOs4Sb12 Reviewed

Y. Asano, Y. Tanaka, Y. Matsuda, S. Kashiwaya. and H. Tsuchiura.

Physica C Vol. 412-414 page： 235-239 2004

注目の論文, 3角格子酸化物における超伝導の発見, －フラストレートした系で期待される異方的超伝導状態－ Invited

田仲由喜夫, 浅野泰寛

月刊　化学 Vol. 59 ( 2 ) page： 54-55 2004

Theory of charge transport in diffusive normal metal / unconventional singlet superconductor point contacts Reviewed

Y. Tanaka, Y.V. Nazarov, A. Golubov and S. Kashiwaya

Physical Review B Vol. 69 No. 14 2004 Vol. 69 ( 14 ) page： 144519_1-16 2004

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

We analyze the transport properties of contacts between unconventional superconductor and normal diffusive
metal in the framework of the extended circuit theory. We obtain a general boundary condition for the
Keldysh-Nambu Green's functions at the interface that is valid for arbitrary transparencies of the interface.
This allows us to investigate the voltage-dependent conductance ~conductance spectrum! of a diffusive normal
metal ~DN!/ unconventional singlet superconductor junction in both ballistic and diffusive cases. For d-wave
superconductors, we calculate conductance spectra numerically for different orientations of the junctions,
resistances, Thouless energies in DN, and transparencies of the interface. We demonstrate that conductance
spectra exhibit a variety of features including a V-shaped gaplike structure, zero bias conductance peak ~ZBCP!
and zero bias conductance dip.

酸化物超伝導体におけるJosephson効果 Invited

浅野泰寛田仲由喜夫　柏谷聡

豊田研究報告 Vol. 57 page： 1-7 2004

Anomalous magnetic field tunneling of YBCO junctions -Possible detection of non-Fermi-liquid states- Reviewed

H. Kashiwaya, S. Kashiwaya, B. Prijamboedi, A. Sawa, I. Kurosawa, Y. Tanaka and I. Iguchi

Phys. Rev. B Vol. 70 page： 094501_1-5 2004

Variational Monte Carlo Studies of Pairing Symmetry for the t-J Model on a Triangular Lattice Reviewed

T. Watanabe, H. Yokoyama, Y. Tanaka, J. Inoue and M. Ogata

Journal of Physical Society of Japan Vol. 73 ( 12 ) page： 3404-3412 2004

Macroscopic quantum tunneling and quasiparticle dissipation in d-wave superconductor Josephson junctions Reviewed

S. Kawabata, S. Kashiwaya, Y. Asano and Y. Tanaka

Physical Review B Vol. 70 page： 132505_1-4 2004

Microscopic theory of f-wave pairing in quasi-1D organic superconductors Reviewed

Y. Tanaka and K. Kuroki

Physical Review B Vol. 70 page： R11430_1-4 2004

Impurity scattering effect on the charge transport on high Tc cuprate junctions Invited Reviewed

Y. Tanaka, Y. Asano and S. Kashiwaya

Fizika Nizkikh Tenperatur Vol. 30 ( 7-8 ) page： 780-794 2004

Possible spin-triple f-wave pairing due to disconnected Fermi surfaces in NaxCoO2yH2O Reviewed

K. Kuroki, Y. Tanaka and R. Arita

Physical Review Letters Vol. 93 page： 077001_1-4 2004

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

We propose that the spin-triplet pairing mechanism due to disconnected Fermi surfaces proposed in
our previous study [Phys. Rev. B 63, 174507 (2001)] may be at work in a recently discovered
superconductor NaxCoO2 yH2O. We introduce a single band effective model that takes into account
the pocketlike Fermi surfaces along with the van Hove singularity near the K point found in the band
calculation results. Applying the fluctuation exchange method and solving the linearized Eliashberg
equation, the most dominant pairing is found to have spin-triplet f-wave symmetry, where the nodes of
the gap function do not intersect the pocket Fermi surfaces. The presence of finite Tc is suggested in
sharp contrast to cases when the gap nodes intersect the Fermi surface.

Josephson effect in organic superconductors (TMTSF)2X Reviewed

Y. Asano, Y. Tanaka, K. Kuroki, Y. Tanuma, H. Tsuchiura and S. Kashiwaya

Journal of the Physical Society of Japan Vol. 73 ( 7 ) page： 1922-1930 2004

Anomalous charge transport in triplet superconductor junctions Reviewed

Y. Tanaka and S. Kashiwaya

Physical Review B Vol. 70 page： 012507_1-4 2004

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

Charge transport properties of a diffusive normal metal/triplet superconductor (DN/TS) junction are studied
based on the Keldysh-Nambu quasiclassical Green's function formalism. Contrary to the unconventional singlet
superconductor junction case, the mid-gap Andreev resonant state at the interface of the TS is shown to
enhance the proximity effect in the DN. The total resistance of the DN/TS junction is drastically reduced and
is completely independent of the resistance of the DN in the extreme case. Such anomalous transport accompanies
a giant zero-bias peak in the conductance spectra and a zero-energy peak of the local density of states
in the DN region. These striking features manifest the presence of novel proximity effect peculiar to triplet
superconductor junctions.

H. Yokoyama, Y. Tanaka, M. Ogata and H. Tsuchiura Reviewed

H. Yokoyama, Y. Tanaka, M. Ogata and H. Tsuchiura

Journal of Physical Society of Japan Vol. 70 ( 5 ) page： 1119-1122 2004

A Phenomenological Theory of Zero-energy Andreev Resonant States Reviewed

Y. Asano, Y. Tanaka and S. Kashiwaya

Physical Review B Vol. 69 ( 14 ) page： 134501_1-11 2004

Quantum Monte Carlo study of the pairing symmetry competition in Hubbard model

K. Kuroki, Y. Tanaka, T. Kimura and R. Arita

Physical Review B Vol. 69 page： 214511_1-8 2004

Split of zero-bias conductance peak in normal-metal / d-wave superconductor junctions Reviewed

Y. Asano, Y. Tanaka and S. Kashiwaya

Physical Review B Vol. 69 page： 214509_1-12 2004

Mesoscopic effect observed in YBa2Cu3O7-d/La0.67Sr0.33MnO3 tunnel junctions Invited Reviewed

H. Kashiwaya, A. Sawa, S. Kashiwaya, I. Kurosawa, N. Yoshida, and Y. Tanaka

Physica B Vol. 329-333 page： 1348-1349 2003

Effect of the randomness on the electron transport in normal metal / insulator / conventional superconductor junctions

Y. Tanaka, N. Kitaura,A. Golubov, H. Itoh,Y. Asano, N. Yoshida,J. Inoue and S. Kashiwaya.

Physica C Vol. 392-396 page： 249-253 2003

Quasiparticle States around Vortex Cores in the t-J Model Reviewed

T. Kuribayashi, H. Tsuchiura, Y. Tanaka, J. Inoue, M. Ogata, and S. Kashiwaya,.

Physica C Vol. 392-396 page： 419-423 2003

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Papers - TANAKA, Yukio