CaFe2As2的磁不稳定性特征
Character of magnetic instabilities in CaFe2As2
摘要：
密度泛函非相互作用的磁化率已在不同阶段的CaFe_2As_2进行了分析，并与纯d-金属的类似数据进行了比较。在“坍缩”相（对应于超导相）中，找到了具有大挫折的“无局域矩”巡游态的条件。这种巡回性决定了波矢的狭窄区域的不稳定性与无公度磁序。对于环境压力相，Fe原子上的局部矩与更少的挫折反铁磁相互作用的稳定和磁短或长程序的所有波矢的发展。
英文摘要：
The density functional non-interacting susceptibility has been analyzed in different phases of CaFe2As2 and compared with similar data for pure d-metals. The conditions for the "no local moment" itinerant state with large frustrations are found for the "collapsed" phase (corresponding to superconducting phase). This itineracy determines the instability versus the incommensurate magnetic order for the narrow region of wave vectors. For the ambient pressure phase, the local moments on Fe atoms with much less frustrated antiferromagnetic interactions are stabilized and a magnetic short or long range order for all wave vectors is developed.
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