磁性隐藏状态在磁性魔鬼楼梯的底层
Magnetically hidden state on the ground floor of the magnetic Devil's staircase
摘要：
我们研究了SrCu_2（BO_3）_2的低温和高场热力学和超声性质。SrCu_2（BO_3）_2的磁化曲线在27~T以上呈现出不同的平台，称为磁性魔鬼阶梯。本研究的结果证实，磁性结晶，楼梯的第一步，发生在27~T以上的一级转变伴随着急剧的奇异性的热容$C_p$和扭结的弹性常数。此外，我们还观察到在26 T附近的低磁场的热力学异常，这是以前没有被任何磁探针探测到的。在低温下，这种磁隐态具有较大的熵，并且不表现出Schottky型带隙行为，这表明存在低能集体激发。基于我们的观测和理论预测，我们提出磁四极子在26~T附近形成一个自旋-自旋态，作为磁魔鬼楼梯底层的一个隐藏态。
英文摘要：
We investigated the low-temperature and high-field thermodynamic and ultrasonic properties of SrCu2(BO3)2, which exhibits various plateaux in its magnetization curve above 27~T, called a magnetic Devil's staircase. The results of the present study confirm that magnetic crystallization, the first step of the staircase, occurs above 27~T as a 1st-order transition accompanied by a sharp singularity in heat capacity $C_p$ and a kink in the elastic constant. In addition, we observe a thermodynamic anomaly at lower fields around 26~T, which has not been previously detected by any magnetic probes. At low temperatures, this magnetically hidden state has a large entropy and does not exhibit Schottky-type gapped behavior, which suggests the existence of low-energy collective excitations. Based on our observations and theoretical predictions, we propose that magnetic quadrupoles form a spin-nematic state around 26~T as a hidden state on the ground floor of the magnetic Devil's staircase.
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