论文标题
磁性魔鬼楼梯底楼的磁性隐藏状态
Magnetically hidden state on the ground floor of the magnetic Devil's staircase
论文作者
论文摘要
我们研究了SRCU2（BO3）2的低温和高场热力学和超声特性，该特性在其磁化曲线上表现出各种高于27〜T的磁化曲线，称为磁性魔鬼的楼梯。本研究的结果证实，楼梯的第一步是在27〜T上方的第一步，作为一阶转变，伴随着热容量$ C_P $的尖锐奇异性，而弹性常数的扭结。此外，我们观察到26〜t左右的较低场的热力学异常，任何磁探针先前尚未检测到。在低温下，这种磁性隐藏的状态具有较大的熵，并且没有表现出Schottky型的外观行为，这表明存在低能量的集体激发。基于我们的观察和理论预测，我们提出磁性四极杆在26〜2 t左右的旋转状态形成磁性魔鬼楼梯底层的隐藏状态。
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.
