SELF-ORGANIZED CRITICALITY WITH CONTINUOUSLY VARYING EXPONENTS

被引：17

作者：

DHAR, D

THOMAS, PB

机构：

[1] Theoretical Physics Group, Tata Institute of Fundamental Research, Bombay, 400005, Homi Bhabha Road

来源：

EUROPHYSICS LETTERS | 1993年 / 21卷 / 09期

关键词：

DYNAMIC PROPERTIES (INC DYNAMIC SUSCEPTIBILITY; SPIN WAVES; SPIN DIFFUSION; DYNAMIC SCALING); MAGNETIZATION CURVES; HYSTERESIS; BARKHAUSEN AND RELATED EFFECTS; FLUCTUATION PHENOMENA; RANDOM PROCESSES; AND BROWNIAN MOTION;

D O I：

10.1209/0295-5075/21/9/015

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider the hysteretic response of a system of two-dimensional planar spins in contact with a heat bath, to a uniform external magnetic field varying sinusoidally in time. The temperature is below the Kosterlitz-Thouless transition temperature T(KT). We show that for small H0 and omega, the area of the hysteresis loop scales as (H0omega)alpha, where H0 is the amplitude and omega the frequency of the external field, and alpha is an exponent which varies continuously from 1/2 to 16/31, as the temperature increases from zero to T(KT). This is an example of a driven dissipative system which shows self-organized criticality with continuously varying exponents.

引用

页码：965 / 970

页数：6

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