Department of Physics Papers

Document Type

Journal Article

Date of this Version

9-1-1977

Publication Source

Physical Review B

Volume

16

Issue

5

Start Page

2141

Last Page

2147

DOI

10.1103/PhysRevB.16.2141

Abstract

A general model in which the nearest-neighbor exchange interactions J(x⃗ ,x⃗) are of the form J(x⃗ ,x⃗)=J1+J2ε(x⃗ )ε(x⃗)+J3[ε(x⃗ )+ε(x⃗)]+J4μ(x⃗ ,x⃗) is considered. Here ε(x⃗ ) is a random site variable and μ(x⃗ ,x⃗) is a random bond variable. It is argued that J4 tends to produce the Edwards-Anderson-type spin glass, whereas J2 produces a different type of phase which is like an alloy of up and down spins. That these two phases are distinct follows from the existence of a phase boundary in the J2−J4 plane when J1=J3=0. A consistent, but qualitative, discussion of this model via the renormalization group is also given.

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Date Posted: 12 August 2015

This document has been peer reviewed.