115In NQR study with evidence for two magnetic quantum critical points in dual Ce site superconductor Ce3PtIn11
115In NQR study with evidence for two magnetic quantum critical points in dual Ce site superconductor Ce3PtIn11
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115 在 NQR 研究中，有证据表明双 Ce 位超导体 Ce3PtIn11 中有两个磁量子临界点
DOI：
10.1103/physrevb.101.081103
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发表时间：
2020
影响因子：
3.7
通讯作者：
and J. Custers
中科院分区：
文献类型：
--
作者：
S. Kambe;H. Sakai;Y. Tokunaga;R. E. Walstedt;M. Kratochvilova;K. Uhlirova;and J. Custers
用核四极共振（NQR）方法对含有两个不等价Ce位的重费米子化合物进行了测量。该系统在K和K处出现磁转变，然后进入低于K的超导态。先前的测量表明磁性和超导性在空间上是分离的，只有Ce（2）亚晶格是磁性有序的，量子临界点在压力GPa处，而Ce（1）亚晶格是顺磁性的。然而，目前的核弛豫速率行为揭示了临界自旋波动的存在，表明接近另一个量子临界点，大概是在一个小的负压，这是唯一与Ce（1）亚晶格。有序波矢量被认为是最有可能的。
nuclear quadrupole resonance (NQR) measurements have been carried out on, a heavy fermion compound harboring two inequivalent Ce sites. This system exhibits magnetic transitions atK andK, prior to entering a superconducting state belowK. Previous measurements imply that magnetism and superconductivity are spatially separated and only the Ce(2) sublattice orders magnetically, with a quantum critical point at pressureGPa, while the Ce(1) sublattice is paramagnetic. However, the present nuclear relaxation rate behavior ofreveals the presence of critical spin fluctuations indicative of close proximity to another quantum critical point, presumably at a small negative pressure, which is associated solely with the Ce(1) sublattice. The ordered wave vector is found to be most likely.