Faculty Profiles - TANAKA, Yukio

Papers - TANAKA, Yukio

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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

Electronic states around vortex cores in the t-J model Invited Reviewed

H. Tsuchiura, M. Ogata, Y. Tanaka and S. Kashiwaya

Journal of Low temperature Physics Vol. 131 page： 209-216 2003

Temperature dependence of the Josephson current in a d-wave superconductor junction using the 2-d extended Hubbard model Reviewed

S. Shirai, H. Tsuchiura, Y. Tanaka, J. Inoue and S. Kashiwaya.

Journal of Low temperature Physics Vol. 131 page： 503-507 2003

Doping dependence of superconducting energy gap of NCCO observed by tunneling, Reviewed

S. Kashiwaya, N. Matsubara, B. Prijamboedi, K. Takita, H. Kashiwaya, Y. Asano and Y. Tanaka

Journal of Low temperature Physics Vol. 131 page： 327-330 2003

Charge transport in unconventional superconductor junctions Invited Reviewed

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

Journal of Low temperature Physics Vol. 131 page： 461-470 2003

Far infrared Optical Conductivity of Nb Thin Films Reviewed

H. Shibata, S. Kimura, S. Kashiwaya, S. Kohjiro, K. Oka, Y. Mitsugi and Y. Tanaka

Physica B Vol. 329-333 page： 1369-1370 2003

Superconductivity in Nd2-xCexCuO4-y thin films and effect of Gd and Ni doping Reviewed

B. Prijamboedi, S. Kashiwaya, H. Shiabata, Y. Tanaka and Y. Asano

Physica C Vol. 388-389 page： 439-440 2003

STM/STS study of YBa2Cu3O7 thin films treated with an atomic oxygen beam Reviewed

S. Ueno, S. Kashiwaya, N. Terada, K. Obara, Y. Tanuma, Y. Tanaka, and M. Koyanagi

Physica C Vol. 388-389 page： 96-97 2003

銅酸化物超伝導体における不純物束縛状態 Invited Reviewed Open Access

土浦宏紀、小形正男、田仲由喜夫、柏谷聡

日本物理学会誌　最近の研究から ( 4 ) page： 254-257 2003

Local magnetic moments in vortex cores and around nonmagnetic impurities in two-dimensional t-J model Reviewed

M. Ogata, H. Tsuchiura, Y. Tanaka and S. Kashiwaya

Physica B Vol. 329-333 page： 1453-1454 2003

How to determine pairing symmetry of quasi-1D organic superconductor through magneto-tunneling spectroscopy Reviewed

Y. Tanuma, K. Kuroki, Y. Tanaka, R. Arita, S. Kashiwaya and H. Aoki

Physica C Vol. 388-389 page： 587-588 2003

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Papers - TANAKA, Yukio