Ab initio cycloidal and chiral magnetoelectric responses in Cr2O3

被引：4
|
作者：
Tillack, Natalie [1 ]
Yates, Jonathan R. [1 ]
Radaelli, Paolo G. [2 ]
机构：
[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England
[2] Univ Oxford, Dept Phys, Oxford OX1 3PU, England
来源：
PHYSICAL REVIEW B | 2016年 / 94卷 / 10期
基金：
英国工程与自然科学研究理事会;
关键词：
D O I：
10.1103/PhysRevB.94.100405
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present a thorough density functional theory study of the magnetoelectric (ME) effect in Cr2O3. The spin-lattice ME tensor a was determined in the low-field and spin flop (SF) phases, using the method of dynamical magnetic charges, and found to be the sum of three distinct components. Two of them, a large relativistic "cycloidal" term and a small longitudinal term, are independent on the spin orientation. The third, only active in the SF phases, is also of relativistic origin and arises from magnetic-field-induced chirality, leading to a nontoroidal ME response.
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页数：5
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