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Partial Up-Up-Down Order with the Continuously Distributed Order Parameter in the Triangular AntiferromagnetTmMgGaO4
Physical Review X ( IF 12.5 ) Pub Date : 2020-01-10 , DOI: 10.1103/physrevx.10.011007
Yuesheng Li , Sebastian Bachus , Hao Deng , Wolfgang Schmidt , Henrik Thoma , Vladimir Hutanu , Yoshifumi Tokiwa , Alexander A. Tsirlin , Philipp Gegenwart

We show that frustrated quasidoublets without time-reversal symmetry can host highly unconventional magnetic structures with continuously distributed order parameters even in a single-phase crystal. Our study comprises a comprehensive thermodynamic and neutron diffraction investigation on the single crystal of TmMgGaO4, which entails non-Kramers Tm3+ ions arranged on a geometrically perfect triangular lattice. The crystal electric field randomness caused by the site-mixing disorder of the nonmagnetic Mg2+ and Ga3+ ions merges two lowest-lying crystal electric field singlets of Tm3+ into a ground-state quasidoublet. Well below Tc0.7K, a small fraction of the antiferromagnetically coupled Tm3+ Ising quasidoublets with small inner gaps condense into two-dimensional up-up-down magnetic structures with continuously distributed order parameters, and give rise to the columnar magnetic neutron reflections below μ0Hc2.6T, with highly anisotropic correlation lengths, ξab250a in the triangular plane and ξc<c/12 between the planes. The remaining fraction of the Tm3+ ions remain nonmagnetic at 0 T and become uniformly polarized by the applied longitudinal field at low temperatures. We argue that the similar model can be generally applied to other compounds of non-Kramers rare-earth ions with correlated ground-state quasidoublets.

中文翻译:

三角反铁磁体TmMgGaO4中具有连续分布的阶跃参数的部分上-下-阶

我们表明,没有时间反转对称性的沮丧准双峰态即使在单相晶体中也可以容纳具有连续分布的阶跃参数的高度非常规的磁性结构。我们的研究包括对单晶硅的全面热力学和中子衍射研究。钛镁4,这需要非克拉默 Tm值3+离子排列在几何上完美的三角晶格上。非磁性的位混合效应引起的晶体电场随机性2+3+ 离子合并两个最低的晶体电场单线态 Tm值3+变成基态准双峰。远低于ŤC0.7ķ,反铁磁耦合的一小部分 Tm值3+具有较小内部间隙的伊辛准双峰会聚成具有连续分布的阶次参数的二维上下磁结构,并在下面引起柱状磁中子反射μ0HC2.6Ť具有高度各向异性的相关长度, ξ一种b250一种 在三角形平面上 ξC<C/12在飞机之间。剩下的部分Tm值3+离子在0 T时保持非磁性,并在低温下被施加的纵向场均匀极化。我们认为,类似的模型通常可以应用于具有相关基态准双峰的其他非克拉默斯稀土离子化合物。
更新日期:2020-01-10
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