Faculty Profiles - KONTANI, Hiroshi

Papers - KONTANI, Hiroshi

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Possible appearance of superconductivity on Si(100) surface

Kino H, Kontani H

SURFACE SCIENCE Vol. 482 page： 501 - 506 2001.6

Theory of the Hall coefficient and resistivity for the layered organic superconductors kappa-(BEDT-TTF)(2)X

Kontani H, Kino H

PHYSICAL REVIEW B Vol. 63 ( 13 ) 2001.4

Comment on "Charge-orbital stripe structure in La1-xCaxMnO3 (x=1/2, 2/3)" - Reply

Mutou T, Kontani H

PHYSICAL REVIEW LETTERS Vol. 86 ( 11 ) page： 2479 - 2479 2001.3

Comment on "Charge-orbital stripe structure in La1-xCaxMnO3 (x=1/2, 2/3)"

Hotta T, Dagotto E, Koizumi H, Takada Y

PHYSICAL REVIEW LETTERS Vol. 86 ( 11 ) page： 2478 - 2478 2001.3

Hall effect in high-T-c superconductors

Kontani H, Kanki K, Ueda K

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS Vol. 62 ( 1-2 ) page： 83 - 87 2001

Possible appearance of superconductivity on Si(001) surface

Kino H, Kontani H

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 69 ( 7 ) page： 1962 - 1965 2000.7

Origin of the charge-ordered stripe with the orbital ordering in manganese oxides

Mutou T, Kontani H

PHYSICA B Vol. 281 page： 531 - 533 2000.6

Anomalous behaviors of the transport phenomena in high-T-c superconductors

Kontani H, Kanki K, Ueda K

PHYSICA B Vol. 281 page： 808 - 809 2000.6

Charge-orbital stripe structure in La1-xCaxMnO3 (x=1/2, 2/3)

Mutou T, Kontani H

PHYSICAL REVIEW LETTERS Vol. 83 ( 18 ) page： 3685 - 3688 1999.11

Effects of spin fluctuations and superconductivity in quasi-one-dimensional organic conductors

Kino H, Kontani H

JOURNAL OF LOW TEMPERATURE PHYSICS Vol. 117 ( 3-4 ) page： 317 - 321 1999.11

Hall effect and resistivity in high-Tc superconductors: The conserving approximation Reviewed

H. Kontani, K. Kanki, and K. Ueda

Physical Review B. Vol. 59 ( 22 ) page： 14723-14739 1999.7

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

The Hall coefficient RH in high-Tc cuprates in the normal state shows the striking non-Fermi-liquid behavior: RH follows a Curie-Weiss type temperature dependence and |RH|≫1/|ne| at low temperatures in the underdoped compounds. Moreover, RH is positive for hole-doped compounds and negative for electron-doped ones, although each of them has a similar holelike Fermi surface. In this paper, we give the explanation of this long-standing problem from the standpoint of the nearly antiferromagnetic (AF) Fermi liquid. We consider seriously the vertex corrections for the current which are indispensable to satisfy the conservation laws, which are violated within the conventional Boltzmann transport approximation. The obtained total current Jk takes an enhanced value and is no longer perpendicular to the Fermi surface due to the strong AF fluctuations. By virtue of this mechanism, the anomalous behaviors of RH in high-Tc cuprates are naturally explained. Both the temperature and the (electron, hole) doping dependences of RH in high-Tc cuprates are reproduced well by numerical calculations based on the fluctuation-exchange approximation, applied to the single-band Hubbard model with a holelike Fermi surface. We also discuss the singular temperature dependence of RH in other nearly AF metals, e.g., V2O3, κ-BEDT-TTF organic superconductors, and heavy fermion systems close to the AF phase boundary.

Hall effect and resistivity in high-T-c superconductors: The conserving approximation

Kontani H, Kanki K, Ueda K

PHYSICAL REVIEW B Vol. 59 ( 22 ) page： 14723 - 14739 1999.6

Theory of Hall effect and electrical transport in high-T-c cuprates: Effects of antiferromagnetic spin fluctuations

Kanki K, Kontani H

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 68 ( 5 ) page： 1614 - 1624 1999.5

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

Kino H, Kontani H

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 68 ( 5 ) page： 1481 - 1484 1999.5

Anomalous Hall effect in Sr2RuO4

Miyazawa M, Kontani H, Yamada E

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Vol. 68 ( 5 ) page： 1625 - 1631 1999.5

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 Vol. 67 ( 11 ) page： 3691 - 3694 1998.11

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

Hiori Kino and Hiroshi Kontani

Journal of the Physical Society of Japan Vol. 1998 ( 7 ) page： 3691-3694 1998.7

Language：English Publishing type：Research paper (scientific journal)

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 Vol. 80 ( 25 ) page： 5619 - 5622 1998.6

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 Vol. 66 ( 8 ) page： 2252 - 2255 1997.8

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 Vol. 66 ( 8 ) page： 2232 - 2235 1997.8

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Papers - KONTANI, Hiroshi