A. Oguri

Theory of Giant Magnetoresistance in Metallic Superlattices

The random exchange potential at the interfaces between magnetic and nonmagnetic layers is proposed to be an origin of the giant magnetoresistance in metallic superlattices. The material dependence of the potential is calculated for transition metal elements. An analysis using the Boltzmann equation shows that the theoretical results of the potential explain the giant magnetoresistance observed.

Magnetoresistance in metallic superlattices

Abstract The random exchange potential at the interfaces between magnetic and nonmagnetic layers is proposed to be an origin of the giant magnetoresistance in the metallic superlattices. The material dependence of the magnetoresistance is studied for Fe/TM and TM/Cu superlattices, where TM are the 3d-transition metal elements. The calculated results are consistent with the experimental ones. Some possible combinations of materials which may show large magnetoresistance are predicted.

Gutzwiller wave function in the three-band Hubbard model: A variational Monte Carlo study.

The Gutzwiller wave function for the three-band Hubbard model on a two dimensional CuO

Numerical study of the conductance in magnetic superlattices

_2

A variational Monte Carlo study of the three-band Hubbard model

plane is studied by using the variational Monte Carlo (VMC) method in the limit

Transport and thermal properties in RVB states

U_d to infty

Antiferromagnetic state in the three-band Hubbard model

, where

Hole and its surrounding spins in a quantum spin-liquid state

U_d

Thermopower and resistivity in strongly correlated electron systems

is the Coulomb repulsion between holes on a Cu site. The VMC results for the energy and the fraction of

GIANT MAGNETORESISTANCE IN MAGNETIC GRANULAR ALLOYS

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