LaCo $_2$ P $_2$中短程和长程磁序的共存
Co-existence of short- and long-range magnetic order in LaCo$_2$P$_2$
摘要：
用正μ子自旋旋转、弛豫和共振（$μ^+$ SR）技术研究了金属LaCo $_2$ P $_2$的铁磁性质.横向和零场$μ^+$ SR测量表明，该化合物在$T_{\rm C}=130.91(65)$ ~K处进入长程FM基态，与先前的研究一致。基于已报道的FM结构，计算了μ子位置的内部磁场，并利用第一性原理计算对μ子位置进行了预测。计算结果与实验数据吻合较好。此外，虽然LaCo $_2$ P $_2$在较高温度$T>160$ ~K下是顺磁体，但对于$T_{\rm C}<T\leq160$ ~K，它进入短程有序（SRO）磁相.低于$T_{\rm C}$附近的测量表明，SRO相共存的温度$124\leq T\leq T_{\rm C}$的长程FM命令。这种共存是一种内在属性，源于2D和3D相互作用/波动之间的竞争。
英文摘要：
The ferromagnetic (FM) nature of the metallic LaCo$_2$P$_2$ was investigated with the positive muon spin rotation, relaxation and resonance ($μ^+$SR) technique. Transverse and zero field $μ^+$SR measurements revealed that the compound enters a long range FM ground state at $T_{\rm C}=130.91(65)$~K, consistent with previous studies. Based on the reported FM structure, the internal magnetic field was computed at the muon sites, which were predicted with first principles calculations. The computed result agree well with the experimental data. Moreover, although LaCo$_2$P$_2$ is a paramagnet at higher temperatures $T>160$~K, it enters a short range ordered (SRO) magnetic phase for $T_{\rm C}<T\leq160$~K. Measurements below the vicinity of $T_{\rm C}$ revealed that the SRO phase co-exists with the long range FM order at temperatures $124\leq T\leq T_{\rm C}$. Such co-existence is an intrinsic property and stems from competition between the 2D and 3D interactions/fluctuations.
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