HIGH-FIELD MAGNETOTRANSPORT IN A PERCOLATING MEDIUM

被引：23

作者：

SARYCHEV, AK ^{[1
]}

BERGMAN, DJ ^{[1
]}

STRELNIKER, YM ^{[1
]}

机构：

[1] TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL

来源：

EUROPHYSICS LETTERS | 1993年 / 21卷 / 08期

关键词：

GALVANOMAGNETIC AND OTHER MAGNETOTRANSPORT EFFECTS; CRITICAL POINT PHENOMENA;

D O I：

10.1209/0295-5075/21/8/010

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A discrete network model is used to discuss the critical behaviour of magnetotransport in a percolating medium in the presence of a magnetic field H of arbitrary strength. By applying a real-space renormalization group transformation, we find that there is strong magnetoresistance rho(H) near the percolation threshold. We also find that there are two fixed points; one at p = p(c) and H = 0, and another at p = p(c) and H = infinity. The crossover between them is governed by a new, field-dependent length. In a percolating metal-insulator mixture, the resistivity ratio with and without a field rho(H)/rho(0) is predicted to saturate as p --> p(c) at a value approximately H0.5.

引用

页码：851 / 857

页数：7

共 20 条

[1]

Balagurov B. Ya., 1986, Soviet Physics - Solid State, V28, P1694

[2]

BALAGUROV BY, 1982, SOV PHYS JETP, V55, P744

[3] CRITICAL-BEHAVIOR OF THE LOW-FIELD HALL CONDUCTIVITY AT A PERCOLATION-THRESHOLD [J].