研究者詳細 - 田仲　由喜夫

論文 - 田仲　由喜夫

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

K. Kuroki, Y. Tanaka and R. Arita

Physical Review Letters 93 巻頁： 077001_1-4 2004年

記述言語：英語掲載種別：研究論文（学術雑誌）

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 査読有り

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

Journal of the Physical Society of Japan 73 巻 ( 7 ) 頁： 1922-1930 2004年

Anomalous charge transport in triplet superconductor junctions 査読有り

Y. Tanaka and S. Kashiwaya

Physical Review B 70 巻頁： 012507_1-4 2004年

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）

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 査読有り

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

Journal of Physical Society of Japan 70 巻 ( 5 ) 頁： 1119-1122 2004年

A Phenomenological Theory of Zero-energy Andreev Resonant States 査読有り

Y. Asano, Y. Tanaka and S. Kashiwaya

Physical Review B 69 巻 ( 14 ) 頁： 134501_1-11 2004年

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

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

Physical Review B 69 巻頁： 214511_1-8 2004年

Split of zero-bias conductance peak in normal-metal / d-wave superconductor junctions 査読有り

Y. Asano, Y. Tanaka and S. Kashiwaya

Physical Review B 69 巻頁： 214509_1-12 2004年

Mesoscopic effect observed in YBa2Cu3O7-d/La0.67Sr0.33MnO3 tunnel junctions 招待有り査読有り

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

Physica B 329-333 巻頁： 1348-1349 2003年

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 392-396 巻頁： 249-253 2003年

Quasiparticle States around Vortex Cores in the t-J Model 査読有り

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

Physica C 392-396 巻頁： 419-423 2003年

Electronic states around vortex cores in the t-J model 招待有り査読有り

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

Journal of Low temperature Physics 131 巻頁： 209-216 2003年

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

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

Journal of Low temperature Physics 131 巻頁： 503-507 2003年

Doping dependence of superconducting energy gap of NCCO observed by tunneling, 査読有り

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

Journal of Low temperature Physics 131 巻頁： 327-330 2003年

Charge transport in unconventional superconductor junctions 招待有り査読有り

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

Journal of Low temperature Physics 131 巻頁： 461-470 2003年

Far infrared Optical Conductivity of Nb Thin Films 査読有り

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

Physica B 329-333 巻頁： 1369-1370 2003年

Superconductivity in Nd2-xCexCuO4-y thin films and effect of Gd and Ni doping 査読有り

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

Physica C 388-389 巻頁： 439-440 2003年

STM/STS study of YBa2Cu3O7 thin films treated with an atomic oxygen beam 査読有り

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

Physica C 388-389 巻頁： 96-97 2003年

銅酸化物超伝導体における不純物束縛状態招待有り査読有り 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 ) 頁： 254-257 2003年

ルテニウム超伝導における異常ドップラー効果 Open Access

田仲由喜夫

物性研究 ( 3 ) 頁： 1011-1012 2003年

異方的超伝導体のジョセフソン効果招待有り査読有り

浅野泰寛、田仲由喜夫、柏谷聡

異方的超伝導体のジョセフソン効果 ( 2 ) 頁： 31-45 2003年

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