自旋密度波作为两个相反手征磁态的叠加及其意义
Spin density wave as a superposition of two magnetic states of opposite chirality and its implications
摘要：
具有弱自旋阻挫的磁性固体在低于一定温度时倾向于采用非共线的磁性结构，例如摆线结构，而在稍高于该温度时倾向于采用自旋密度波（SDW）。利用密度泛函理论计算了BaYFeO_4在48 K和36 K以下分别发生SDW和摆线相变的磁性结构，并对这些现象的原因进行了探讨.研究表明，SDW结构是由两个手征相反的磁态叠加而成，由于晶格弛豫，SDW态先于手征磁态，而SDW是横向的还是纵向的则取决于磁性离子的磁各向异性.
英文摘要：
A magnetic solid with weak spin frustration tends to adopt a noncollinear magnetic structure such as cycloidal structure below a certain temperature and a spin density wave (SDW) slightly above this temperature. The causes for these observa-tions were explored by studying the magnetic structures of BaYFeO4, which undergoes an SDW and a cycloidal phase transi-tion below 48 and 36 K, respectively, in terms of density func-tional theory calculations. We show that an SDW structure aris-es from a superposition of two magnetic states of opposite chi-rality, an SDW state precedes a chiral magnetic state due to the lattice relaxation, and whether an SDW is transversal or longitudinal is governed by the magnetic anisotropy of magnetic ions.
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