标题： 旋转格涅津系数：各向异性系统中量子临界性的探测器 显示英文标题

标题： Rotational Grüneisen ratio: a probe for quantum criticality in anisotropic systems

摘要： 格伦塞斯比 $\Gamma$ 及其磁性类似物，磁性格伦塞斯比 $\Gamma_H$，是研究量子相变性质的有力探针。在这里，我们通过引入外部场的方向作为控制参数，提出一个格伦塞斯参数，即旋转格伦塞斯比 $\Gamma_\phi$。我们通过在宽温度和磁场范围内测量旋转磁卡效应，研究了高度各向异性的顺磁体 CeRhSn 和 CeIrSn 的 $\Gamma_\phi$。我们发现，这两种化合物的 $\Gamma_\phi$数据通过使用相同的临界指数和场不变的临界场角度进行缩放。值得注意的是， $\Gamma_\phi$数据的缩放函数揭示了随着磁场所需轴分量从量子临界线发展而来的高度各向异性量子临界性。本文提供了一种热力学方法来检测和识别高度各向异性系统中的磁性量子临界性。 显示英文摘要

摘要： The Gr\"{u}neisen ratio $\Gamma$ and its magnetic analog, the magnetic Gr\"{u}neisen ratio $\Gamma_H$, are powerful probes to study the nature of quantum phase transitions. Here, we propose a Gr\"{u}neisen parameter, the rotational Gr\"{u}neisen ratio $\Gamma_\phi$, by introducing the orientation of the external field as a control parameter. We investigate $\Gamma_\phi$ of the highly anisotropic paramagnets CeRhSn and CeIrSn by measuring the rotational magnetocaloric effect in a wide range of temperatures and magnetic fields. We find that the $\Gamma_\phi$ data of both compounds are scaled by using the same critical exponents and the field-invariant critical field angle. Remarkably, the scaling function for the $\Gamma_\phi$ data reveals the presence of highly anisotropic quantum criticality that develops as a function of the easy-axis component of the magnetic field from the quantum critical line. This paper provides a thermodynamic approach to detect and identify magnetic quantum criticality in highly anisotropic systems.