Non-monotonic pressure dependence of high-field nematicity and magnetism in CeRhIn5
Non-monotonic pressure dependence of high-field nematicity and magnetism in CeRhIn5
复制标题
DOI：
10.1038/s41467-020-17274-6
复制
发表时间：
2020-07-13
影响因子：
16.6
通讯作者：
Moll, Philip J. W.
中科院分区：
文献类型：
--
作者：
Helm, Toni;Grockowiak, Audrey D.;Moll, Philip J. W.
CeRhIn 5提供了重费米子系统中量子临界性的教科书示例：压力抑制局域矩反铁磁（AFM）秩序，并在p（c）附近的相关量子临界点（QCP）周围的圆顶中诱导超导性。在B-c为50 T的场致QCP条件下，强磁场也抑制了AFM的有序度。在其附近，出现了以大的面内电阻率各向异性为特征的在B-* 接近28 T的超导相。在这里，我们直接调查这些现象之间的相互关系，通过在高压下的磁阻测量。随着压强的增加，相变转移到更高的场，直到它在p（c）以下消失。当接近p（c）时，压力会抑制零场中的磁序，但由于近藤效应的抑制，我们发现在强磁场下磁性会增强。我们揭示了一个强烈的非平均场的相图，比常见的本地时刻描述CeRhIn 5会建议丰富得多。
CeRhIn5 provides a textbook example of quantum criticality in a heavy fermion system: Pressure suppresses local-moment antiferromagnetic (AFM) order and induces superconductivity in a dome around the associated quantum critical point (QCP) near p(c) approximate to 23 kbar. Strong magnetic fields also suppress the AFM order at a field-induced QCP at B-c approximate to 50 T. In its vicinity, a nematic phase at B-* approximate to 28 T characterized by a large in-plane resistivity anisotropy emerges. Here, we directly investigate the interrelation between these phenomena via magnetoresistivity measurements under high pressure. As pressure increases, the nematic transition shifts to higher fields, until it vanishes just below p(c). While pressure suppresses magnetic order in zero field as p(c) is approached, we find magnetism to strengthen under strong magnetic fields due to suppression of the Kondo effect. We reveal a strongly non-mean-field-like phase diagram, much richer than the common local-moment description of CeRhIn5 would suggest.