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arXiv 1706.04735cond-mat.str-elcond-mat.mtrl-sci
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电荷密度波1 T-TaS_2化合物的低温高关联量子相位

The low-temperature highly correlated quantum phase in the charge-density-wave 1T-TaS_2 compound

Marie Kratochvilova, Adrian D. Hillier, Andrew R. Wildes, Lihai Wang, Sang-Wook Cheong, Je-Geun Park

摘要:

准二维金属化合物1 T-TaS_2由于其Mott绝缘基态和电荷密度波(CDW)有序之间的复杂相互作用而被广泛研究。在低温阶段,13个Ta_{4+} 5 \textit{d} -电子中的1/2个形成六角大卫星图案的分子轨道,留下一个5 \textit{d} -电子,其中\textit{S} = 1/2自旋自由。这种具有大的自旋-轨道相互作用的孤儿量子自旋预计将形成其自身的高度相关相。它们很可能在强自旋轨道耦合的希尔伯特空间中形成某种短程有序。为了研究其低温磁性,我们进行了一系列的测量,包括中子散射和μ子实验。所获得的数据清楚地表明了短程相的存在,并将磁矩大小的上限设定为~ 0.4 \textit μ B,这与π-自旋方案一致。

英文摘要:

A prototypical quasi-2D metallic compound, 1T-TaS_2 has been extensively studied due to an intricate interplay between a Mott-insulating ground state and a charge density-wave (CDW) order. In the low-temperature phase, 12 out of 13 Ta_{4+} 5\textit{d}-electrons form molecular orbitals in hexagonal star-of-David patterns, leaving one 5\textit{d}-electron with \textit{S} = 1/2 spin free. This orphan quantum spin with a large spin-orbit interaction is expected to form a highly correlated phase of its own. And it is most likely that they will form some kind of a short-range order out of a strongly spin-orbit coupled Hilbert space. In order to investigate the low-temperature magnetic properties, we performed a series of measurements including neutron scattering and muon experiments. The obtained data clearly indicate the presence of the short-ranged phase and put the upper bound on ~ 0.4 \textitμ_B for the size of the magnetic moment, consistent with the orphan-spin scenario.

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