Quantum criticality in Ce1−xSmxCoIn5
Quantum criticality in Ce1−xSmxCoIn5
复制标题
Ce1–xSmxCoIn5 中的量子临界性
DOI：
10.1103/physrevb.103.224519
复制
发表时间：
2021
影响因子：
3.7
通讯作者：
Almasan, C. C.
中科院分区：
文献类型：
--
作者：
Kunwar, D. L.;Adhikari, R. B.;Pouse, N.;Maple, M. B.;Dzero, M.;Almasan, C. C.
由于在重费米子合金中观察到磁性和非常规超导性共存的可能性，我们通过比热和电阻率测量研究了铈位置上的钐取代如何影响化学计量的磁场调谐量子临界性。通过施加外磁场，我们观察到费米液体到非费米液体交叉的温度依赖性的电子比热归一化的温度和电阻率。我们得到了磁场诱导的量子临界点（QCP）外推到零温度的温度-磁场依赖性发生交叉。此外，电子比热的标度分析被用来确认QCP的存在。我们发现，磁场诱导的QCP的大小随钐浓度的增加而减小。我们的热容和电阻率数据的分析揭示了零场QCP的，其中福尔斯下降的区域内的Sm离子反铁磁性和超导共存。
Motivated by the possibility of observing the coexistence between magnetism and unconventional superconductivity in heavy-fermionalloys, we studied how the samarium substitution on the cerium site affects the magnetic field-tuned-quantum criticality of stoichiometricby performing specific heat and resistivity measurements. By applying an external magnetic field, we have observed Fermi-liquid to non-Fermi-liquid crossovers in the temperature dependence of the electronic specific heat normalized by temperature and of the resistivity. We obtained the magnetic-field-induced quantum critical point (QCP) by extrapolating to zero temperature the temperature-magnetic field dependence at which the crossovers take place. Furthermore, a scaling analysis of the electronic specific heat is used to confirm the existence of the QCP. We have found that the magnitude of the magnetic-field-induced QCP decreases with increasing samarium concentration. Our analysis of heat capacity and resistivity data reveals a zero-field QCP for, which falls inside the region where Sm ions antiferromagnetism and superconductivity coexist.