用$μ$ SR研究YbMn $_2$ Sb $_2$单晶的复磁序
Complex magnetic order in YbMn$_2$Sb$_2$ single crystals observed by $μ$SR
摘要：
本文报道了YbMn $_2$ Sb $_2$单晶的晶体生长、结构、输运和磁性。晶体显示三角对称性（空间群$P\bar{3}m1$），其中MnSb的波纹蜂窝层被Yb原子隔开。在22 K以下没有观察到结构相变。电阻率测量显示出主要的绝缘行为。电阻率、直流磁化率和热容的综合测量证实了在230 K、116 K和27 K的连续转变，即在$T_N$ =116 K的转变是由于Mn $^{+2}$晶格反铁磁有序引起的。μ子自旋旋转实验（$μ$ SR）揭示了一个更复杂的情况下，与温度依赖的磁体积分数反映短程和长程磁序，和一个强烈的无序磁基态。自旋-晶格耦合的作用及其与Mn矩之间的交换相互作用的关系进行了讨论，作为观察到的复杂的磁性行为的可能原因。
英文摘要：
The crystal growth and the structural, transport and magnetic properties of the magnetically frustrated YbMn$_2$Sb$_2$ single crystals are reported. The crystals show a trigonal symmetry (space group $P\bar{3}m1$), where corrugated honeycomb layers of MnSb are separated by Yb atoms. No structural phase transition was observed down to 22~K. The resistivity measurements show a predominantly insulating behavior. The combined resistivity, dc susceptibility and heat capacity measurements confirm successive transitions at 230~K, 116~K and 27~K, being the transition at $T_N$=116~K due to the Mn$^{+2}$ lattice antiferromagnetic ordering. Muon spin rotation experiments ($μ$SR) reveal a more complicated scenario, with temperature dependence of the magnetic volume fraction reflecting short range and long range magnetic order, and a strongly disordered magnetic ground state. The role of spin-lattice coupling and its relationship with exchange interactions between Mn moments are discussed as possible cause of the complex magnetic behavior observed.
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