研究者詳細 - 田仲　由喜夫

論文 - 田仲　由喜夫

分割表示 580 件中 361 - 380 件目／全件表示 >>

Zero-bias Peak in Tunneling Spectra of High-Tc Superconductors and its Splitting 査読有り

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

Physica C 412-414 巻頁： 157-161 2004年

Conductance in Normal-metal / PrOs4Sb12 査読有り

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

Physica C 412-414 巻頁： 235-239 2004年

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－招待有り

田仲由喜夫, 浅野泰寛

月刊　化学 59 巻 ( 2 ) 頁： 54-55 2004年

Theory of charge transport in diffusive normal metal / unconventional singlet superconductor point contacts 査読有り

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

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

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効果招待有り

浅野泰寛田仲由喜夫　柏谷聡

豊田研究報告 57 巻頁： 1-7 2004年

Anomalous magnetic field tunneling of YBCO junctions -Possible detection of non-Fermi-liquid states- 査読有り

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

Phys. Rev. B 70 巻頁： 094501_1-5 2004年

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

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

Journal of Physical Society of Japan 73 巻 ( 12 ) 頁： 3404-3412 2004年

Macroscopic quantum tunneling and quasiparticle dissipation in d-wave superconductor Josephson junctions 査読有り

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

Physical Review B 70 巻頁： 132505_1-4 2004年

Microscopic theory of f-wave pairing in quasi-1D organic superconductors 査読有り

Y. Tanaka and K. Kuroki

Physical Review B 70 巻頁： R11430_1-4 2004年

Impurity scattering effect on the charge transport on high Tc cuprate junctions 招待有り査読有り

Y. Tanaka, Y. Asano and S. Kashiwaya

Fizika Nizkikh Tenperatur 30 巻 ( 7-8 ) 頁： 780-794 2004年

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

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