Singular field response and singular screening of vacancies in antiferromagnets.
Singular field response and singular screening of vacancies in antiferromagnets.
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反铁磁体中空位的奇异场响应和奇异筛选
DOI：
10.1103/physrevlett.109.177203
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发表时间：
2012
影响因子：
8.6
通讯作者：
M. Vojta
中科院分区：
文献类型：
--
作者：
A. Wollny;E. C. Andrade;M. Vojta
对于有序局域磁矩反铁磁体中的孤立空位，我们证明了磁场线性响应极限一般是奇异的：在极限中，空位在零场中的磁矩不同于空位在有限场中的磁矩。起源是一个普遍的和奇异的屏蔽云，而且导致完美的屏蔽，因为磁体显示自旋翻转体态在弱场极限。
For isolated vacancies in ordered local-moment antiferromagnets we show that the magnetic-field linear-response limit is generically singular: The magnetic moment associated with a vacancy in zero field is different from that in a finite fieldin the limit. The origin is a universal and singular screening cloud, which moreover leads to perfect screening asfor magnets which display spin-flop bulk states in the weak-field limit.