ANOMALOUS SPIN-DIFFUSION IN A 2-DIMENSIONAL PERCOLATING ISING ANTIFERROMAGNET

被引：9

作者：

IKEDA, H ^{[1
]}

ITOH, S ^{[1
]}

ADAMS, MA ^{[1
]}

机构：

[1] RUTHERFORD APPLETON LAB,ISIS FACIL,DIDCOT OX11 0QX,OXON,ENGLAND

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.75.4440

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Anomalous diffusive motions of spins in a near-percolating Ising antiferromagnet, Rb2Co0.6Mg0.4F4, have been observed by high-energy-resolution neutron inelastic scattering. The scattering function integrated over momentum space in the paramagnetic phase reveals a long-tailed spectrum having the form E(-(0.35+/-0.06)) superimposed on the Lorentzian line shape, which originates from the normal critical magnetic scattering. This observation of a power-law decay function is a direct measurement of anomalous diffusion in a system with fractal geometry.

引用

页码：4440 / 4443

页数：4

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