EFFECTS OF A GAUSSIAN RANDOM-FIELD N THE SHERRINGTON-KIRKPATRICK SPIN-GLASS

被引：35

作者：

SOARES, RF

NOBRE, FD

DEALMEIDA, JRL

机构：

[1] UNIV FED RIO GRANDE NORTE, DEPT FIS TOER & EXPTL, BR-59072970 NATAL, RN, BRAZIL

[2] UNIV HOUSTON, TEXAS CTR SUPERCONDUCT, HOSUTON, TX 77204 USA

[3] UNIV HOSUTON, DEPT PHYS, HOUSTON, TX 77204 USA

[4] UFPE, DEPT FIS, BR-50670901 RECIFE, PE, BRAZIL

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.50.6151

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The infinite-range Ising spin glass in the presence of a Gaussian random field is investigated by means of the replica method. The replica-symmetric solution and its instability are discussed; it is shown that the Almeida-Thouless instability regions are always reduced by the random field. The crossover exponent phi associated with the irreversibility line is shown to be nonuniversal in the presence of a random field, varying in a range from 1 to 3. Some of our results are compared with recent experimental measurements performed in the diluted antiferromagnet FexZn1-xF2.

引用

页码：6151 / 6156

页数：6

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