倾斜磁场中CeRhIn $_5$中30 T跃迁的起源
Origin of the 30 T transition in CeRhIn$_5$ in tilted magnetic fields
摘要：
我们提出了一个全面的超声研究的原型重费米子材料CeRhIn $_5$，检查神秘的30 T过渡的起源。对于从$c$轴施加在2 $^\circ$处的场，我们在低温下的所有破胶超声模式中观察到声速的两个尖锐异常，分别为$B_m \approx$ 20 T和$B^* \approx$ 30 T。低场异常对应于著名的一阶变磁性的inexaminate-to-commodity转变。更高的磁场异常发生在30 T，在那里以前建议发生电子-电子跃迁。这两种异常，只在反铁磁状态下观察到的，是相似的形状，但相应的变化的超声速度有相反的迹象。基于我们的实验结果，我们认为在$B^*$中发生了从一个公度态到另一个无公度反铁磁态的场致磁跃迁。随着从$c$轴的场角的进一步增加，$B^*$处的异常缓慢地移动到更高的场，变宽，并且幅度变小。从$c$轴追踪到30 $^\circ$，在低于36 T的40 $^\circ$处不再观察到。
英文摘要：
We present a comprehensive ultrasound study of the prototypical heavy-fermion material CeRhIn$_5$, examining the origin of the enigmatic 30 T transition. For a field applied at 2$^\circ$ from the $c$ axis, we observed two sharp anomalies in the sound velocity, at $B_m \approx$ 20 T and $B^* \approx$ 30 T, in all the symmetry-breaking ultrasound modes at low temperatures. The lower-field anomaly corresponds to the well-known first-order metamagnetic incommensurate-to-commensurate transition. The higher-field anomaly takes place at 30 T, where an electronic-nematic transition was previously suggested to occur. Both anomalies, observed only within the antiferromagnetic state, are of similar shape, but the corresponding changes of the ultrasound velocity have opposite signs. Based on our experimental results, we suggest that a field-induced magnetic transition from a commensurate to another incommensurate antiferromagnetic state occurs at $B^*$. With further increasing the field angle from the $c$ axis, the anomaly at $B^*$ slowly shifts to higher fields, broadens, and becomes smaller in magnitude. Traced up to 30$^\circ$ from the $c$ axis, it is no longer observed at 40$^\circ$ below 36 T.
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