CeRhIn $_5$和CeCoIn $_5$的高压phase diagrams的交流量热法研究
High pressure phase diagrams of CeRhIn$_5$ and CeCoIn$_5$ studied by ac calorimetry
摘要：
用交流量热法和交流磁化率测量方法研究了重费米子反铁磁体CeRhIn $_5$和重费米子超导体CeCoIn $_5$在静水压下的压温相图。在CeRhIn $_5$中，使用高流体静压传输介质允许通过反铁磁和超导转变的体探针进行干净的同时测定。我们将新相图与以前的相图进行了比较，讨论了各种线的性质（一阶或二阶），以及反铁磁序和超导电性的共存。超导热异常的温度与反铁磁转变的加宽之间的联系表明，在$P_c \approx 1.95$ GPa以下，超导性的出现是不均匀的。只有在这个临界压力以上才能观察到均匀体超导性。本文详细分析了压力不均匀性对比热异常的影响，强调了在$P_c$附近观测到的跃迁展宽与一级跃迁有关。对于CeCoIn $_5$，我们表明，在$T_c$在环境压力下观察到的大比热异常被线性抑制至少高达3 GPa。
英文摘要：
The pressure-temperature phase diagrams of the heavy fermion antiferromagnet CeRhIn$_5$ and the heavy fermion superconductor CeCoIn$_5$ have been studied under hydrostatic pressure by ac calorimetry and ac susceptibility measurements using diamond anvil cells with argon as pressure medium. In CeRhIn$_5$, the use of a highly hydrostatic pressure transmitting medium allows for a clean simultaneous determination by a bulk probe of the antiferromagnetic and superconducting transitions. We compare our new phase diagram with the previous ones, discuss the nature (first or second order) of the various lines, and the coexistence of antiferromagnetic order and superconductivity. The link between the collaps of the superconducting heat anomaly and the broadening of the antiferromagnetic transition points to an inhomogeneous appearence of superconductivity below $P_c \approx 1.95$ GPa. Homogeneous bulk superconductivity is only observed above this critical pressure. We present a detailed analysis of the influence of pressure inomogeneities on the specific heat anomalies which emphasizes that the observed broadening of the transitions near $P_c$ is connected with the first order transition. For CeCoIn$_5$ we show that the large specific heat anomaly observed at $T_c$ at ambient pressure is suppressed linearly at least up to 3 GPa.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
