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Local magnetism and spin dynamics of the frustrated honeycomb rhodateLi2RhO3
Physical Review B ( IF 3.2 ) Pub Date : 2017-09-25 00:00:00 , DOI: 10.1103/physrevb.96.094432
P. Khuntia , S. Manni , F. R. Foronda , T. Lancaster , S. J. Blundell , P. Gegenwart , M. Baenitz

We report magnetization, heat capacity, Li7 nuclear magnetic resonance (NMR), and muon-spin rotation (μSR) measurements on the honeycomb 4d5 spin liquid candidate Li2RhO3. The magnetization in small magnetic fields provides evidence of the partial spin-freezing of a small fraction of Rh4+ moments at 6 K, whereas the Curie-Weiss behavior above 100 K suggests a pseudo-spin-1/2 paramagnet with a moment of about 2.2μB. The magnetic specific heat (Cm) exhibits no field dependence and demonstrates the absence of long-range magnetic order down to 0.35 K. Cm/T passes through a broad maximum at about 10 K and CmT2 at low temperatures. Measurements of the spin-lattice relaxation rate (1/T1) reveal a gapless slowing-down of spin fluctuations upon cooling with 1/T1T2.2. The results from NMR and μSR are consistent with a scenario in which a minority of Rh4+ moments are in a short-range correlated frozen state and coexist with a majority of moments in a liquid-like state that continue to fluctuate at low temperatures.

中文翻译:

蜂窝状铑铑酸盐Li2RhO3的局部磁性和自旋动力学

我们报告磁化强度,热容量, 7 核磁共振(NMR)和μ自旋旋转(μSR)在蜂窝上的测量 4d5 自旋液体候选 2个3。小磁场中的磁化强度提供了小部分磁场的部分自旋冻结的证据4+ 力矩在6 K时,而居里-魏斯行为在100 K以上时表明伪自旋1/2顺磁体的力矩约为 2.2μ。磁比热(C)没有磁场依赖性,并且证明了低至0.35 K的远距离磁阶不存在。 C/Ť 经过约10 K的最大最大值, CŤ2个在低温下。自旋晶格弛豫率的测量(1个/Ť1个)揭示了冷却后自旋波动的无间隙减慢 1个/Ť1个Ť2.2。NMR和μSR 与以下情况一致: 4+ 矩处于短程相关冻结状态,并与大多数呈液态的矩并存,并在低温下持续波动。
更新日期:2017-09-25
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