Faculty Profiles - KONTANI, Hiroshi

Papers - KONTANI, Hiroshi

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Quantum fluctuations and frustration of the collinear phase in CaV3O7

Kontani H, Zhitomirsky ME, Ueda K

PHYSICA B Vol. 230 page： 752 - 755 1997.2

Plaquette resonating-valence-bond ground state of CaV4O9

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

JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. 29 page： S128 - S130 1996.8

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

Ueda K, Kontani H, Sigrist M, Lee PA

PHYSICAL REVIEW LETTERS Vol. 76 ( 24 ) page： 4650 - 4650 1996.6

Effect of quantum fluctuations on magnetic ordering in CaV3O7

Kontani H, Zhitomirsky ME, Ueda K

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 65 ( 6 ) page： 1566 - 1569 1996.6

Phase diagram of depleted Heisenberg model for CaV4O9

Troyer M, Kontani H, Ueda K

PHYSICAL REVIEW LETTERS Vol. 76 ( 20 ) page： 3822 - 3825 1996.5

Plaquette resonating-valence-bond ground state of CaV4O9

Ueda K, Kontani H, Sigrist M, Lee PA

PHYSICAL REVIEW LETTERS Vol. 76 ( 11 ) page： 1932 - 1935 1996.3

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

Hiroshi Kontani and Kosaku Yamada

Journal of the Physical Society of Japan Vol. 65 ( 1 ) page： 172-188 1996.1

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

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 Vol. 46 page： 1903 - 1904 1996

Theory of Anomalous Hall Effect in Heavy Fermion System Reviewed

Hiroshi Kontani and Kosaku Yamada

Journal of the Physical Society of Japan Vol. 1994 ( 7 ) page： 2627-2652 1994.7

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

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 Vol. 89 ( 6 ) page： 1155 - 1166 1993.6

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Papers - KONTANI, Hiroshi