研究者詳細 - 紺谷　浩

論文 - 紺谷　浩

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Effects of spin fluctuations in quasi-one-dimensional organic superconductors

Kino H, Kontani H

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 68 巻 ( 5 ) 頁： 1481 - 1484 1999年5月

Anomalous Hall effect in Sr2RuO4

Miyazawa M, Kontani H, Yamada E

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 68 巻 ( 5 ) 頁： 1625 - 1631 1999年5月

Phase diagram of superconductivity on the anisotropic triangular lattice Hubbard model: An effective model of kappa-(BEDT-TTF) salts

Kino H, Kontani H

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 67 巻 ( 11 ) 頁： 3691 - 3694 1998年11月

Phase Diagram of Superconductivity on the Anisotropic Triangular Lattice Hubbard Model: An Effective Model of κ-(BEDT-TTF) Salts 査読有り

Hiori Kino and Hiroshi Kontani

Journal of the Physical Society of Japan 1998 巻 ( 7 ) 頁： 3691-3694 1998年7月

記述言語：英語掲載種別：研究論文（学術雑誌）

We study the electronic states of the anisotropic triangular lattice Hubbard model at half-filling, which is a simple effective model for the organic superconducting κ-BEDT-TTF compounds. We treat the effect of the Coulomb interaction by the fluctuation exchange (FLEX) method, and obtain the phase diagram of this model for various sets of parameters. It is shown that d-wave superconductivity is realized in a wide region of the phase diagram, next to the antiferromagnetic states. The obtained phase diagram explains well the characteristics of the experimental results.

Electronic properties of the trellis-lattice Hubbard model: Pseudogap and superconductivity

Kontani H, Ueda K

PHYSICAL REVIEW LETTERS 80 巻 ( 25 ) 頁： 5619 - 5622 1998年6月

Theory of anomalous Hall effect in a heavy fermion system with a strong anisotropic crystal field

Kontani H, Miyazawa M, Yamada K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 66 巻 ( 8 ) 頁： 2252 - 2255 1997年8月

Electronic state and magnetic susceptibility in orbitally degenerate (J=5/2) periodic Anderson model

Kontani H, Yamada K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 66 巻 ( 8 ) 頁： 2232 - 2235 1997年8月

Quantum fluctuations and frustration of the collinear phase in CaV3O7

Kontani H, Zhitomirsky ME, Ueda K

PHYSICA B 230 巻頁： 752 - 755 1997年2月

Plaquette resonating-valence-bond ground state of CaV4O9

Ueda K, Troyer M, Kontani H, Sigrist M, Lee PA

JOURNAL OF THE KOREAN PHYSICAL SOCIETY 29 巻頁： S128 - S130 1996年8月

Plaquette resonating-valence-bond ground state of CaV4O9 (vol 76, pg 1932, 1996)

Ueda K, Kontani H, Sigrist M, Lee PA

PHYSICAL REVIEW LETTERS 76 巻 ( 24 ) 頁： 4650 - 4650 1996年6月

Effect of quantum fluctuations on magnetic ordering in CaV3O7

Kontani H, Zhitomirsky ME, Ueda K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 65 巻 ( 6 ) 頁： 1566 - 1569 1996年6月

Phase diagram of depleted Heisenberg model for CaV4O9

Troyer M, Kontani H, Ueda K

PHYSICAL REVIEW LETTERS 76 巻 ( 20 ) 頁： 3822 - 3825 1996年5月

Plaquette resonating-valence-bond ground state of CaV4O9

Ueda K, Kontani H, Sigrist M, Lee PA

PHYSICAL REVIEW LETTERS 76 巻 ( 11 ) 頁： 1932 - 1935 1996年3月

Magnetic Susceptibility of the Orbitally Degenerate ( J = 5/2) Periodic Anderson Model - Analysis on the Basis of the Fermi Liquid Theory - 査読有り

Hiroshi Kontani and Kosaku Yamada

Journal of the Physical Society of Japan 65 巻 ( 1 ) 頁： 172-188 1996年1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）

In the orbitally degenerate (J= 5/2) Periodic Anderson Model, the magnetic susceptibility is composed of both the Pauli term and the Van Vleck term, as is well known. The former is strongly enhanced by the strong correlation between f-electrons. But, for the latter, the influence of the strong correlation has been obscure for years. In this paper we give the solution of the longstanding problem. With the aid of the d=∞ approximation, we study this problem on the basis of the Fermi liquid theory with degenerate orbitals, taking account of all the vertex corrections in a consistent way. As a result, we obtain the simple expression for the magnetic susceptibility, and show unambiguously that the Van Vleck term is also highly enhanced in the strong correlation regime. This fact explains naturally the enhanced magnetic susceptibility observed in many insulating systems (i.e., Kondo insulator). Moreover, we show that the Wilson ratio takes a value around 1 in the metallic system, in good agreement with experiments.

Plaquette resonating-valence-bond ground state of CaV4O9

Kontani H, Troyer M, Ueda K, Sigrist M, Lee PA

CZECHOSLOVAK JOURNAL OF PHYSICS 46 巻頁： 1903 - 1904 1996年

Theory of Anomalous Hall Effect in Heavy Fermion System 査読有り

Hiroshi Kontani and Kosaku Yamada

Journal of the Physical Society of Japan 1994 巻 ( 7 ) 頁： 2627-2652 1994年7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）

The theory of the anomalous Hall effect in the heavy fermion system in the coherent regime is developed on the basis of the periodic Anderson Hamiltonian with degenerate orbitals. The anomalous Hall conductivity arises from the skew-scattering due to the orbital momenta of f-electrons in the presence of magnetic field. By a newly developed analysis based on the phase factor of the f-electron wavefunction in x-y plane, a simple expression for the Hall conductivity σ xy is derived. It makes possible to understand clearly the mechanism and to estimate the sign and the magnitude of the anomalous Hall coefficient. Our theory explains well experimental results in the heavy fermion systems. Finally, we discuss the extension of this theory to explain the temperature dependence of the Hall coefficient in the cuprate high-T c superconductors.

ANOMALOUS HALL-COEFFICIENT IN HEAVY-ELECTRON SYSTEMS

YAMADA K, KONTANI H, KOHNO H, INAGAKI S

PROGRESS OF THEORETICAL PHYSICS 89 巻 ( 6 ) 頁： 1155 - 1166 1993年6月

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