Noncollinear magnetic ordering in small chromium clusters

被引：59

作者：

Kohl, C ^{[1
]}

Bertsch, GF ^{[1
]}

机构：

[1] Univ Washington, Dept Phys, Inst Nucl Theory, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.60.4205

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate noncollinear effects in antiferromagnetically coupled clusters using the general, rotationally invariant form of local spin-density theory. The coupling to the electronic degrees of freedom is treated with relativistic nonlocal pseudopotentials and the ionic structure is optimized by Monte Carlo techniques. We find that small chromium clusters (N less than or equal to 13) strongly favor noncollinear configurations of their local magnetic moments due to frustration. This effect is associated with a significantly lower total magnetization of the noncollinear ground states, ameliorating the disagreement between Stem-Gerlach measurements and previous collinear calculations for Cr-12 and Cr-13. Our results further suggest that the trend to noncollinear configurations might be a feature common to most antiferromagnetic clusters. [S0163-1829(99)10929-9].

引用

页码：4205 / 4211

页数：7

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