Field-Induced Antiferromagnetism and Upper Critical Field in Pressure-Induced Superconductor CeRhIn5
Field-Induced Antiferromagnetism and Upper Critical Field in Pressure-Induced Superconductor CeRhIn5
复制标题
DOI：
10.1143/jpsj.77.084708
复制
发表时间：
2008-08
影响因子：
1.7
通讯作者：
Ida Yuki;Settai Rikio;Ota Yuuki;H. Fuminori;Ōnuki Yoshichika
中科院分区：
文献类型：
--
作者：
Ida Yuki;Settai Rikio;Ota Yuuki;H. Fuminori;Ōnuki Yoshichika
众所周知，反铁磁体CeRhIn 5通过施加压力P而变成超导体。在临界压力Pc <$2.5GPa下，磁场作用下，其电子态发生了变化.我们测量了CeRhIn 5在17 T磁场和2.45 GPa压力下的低温电阻率，并绘制了相图。在P = 2.45GPa（接近Pc = 2.5GPa）时，温度-磁场相图中存在顺磁相、超导相、超导反铁磁相和反铁磁相四种相。发现在磁场作用下，超导相中会产生反铁磁相，而在高于超导临界磁场的磁场作用下，反铁磁相会膨胀。有趣的是，CeRhIn 5的上临界场的各向异性被发现不同于类似的非磁性重费米子超导体CeCoIn 5，揭示了各向异性的参数。
An antiferromagnet CeRhIn 5 is well known to be changed into a superconductor by applying pressure P . Its electronic state is also clarified to be changed at the critical pressure P c ≃2.5 GPa under magnetic fields. We measured the low-temperature electrical resistivity of CeRhIn 5 in magnetic fields up to 17 T and at pressures up to 2.45 GPa, and constructed phase diagrams. At P = 2.45 GPa, which is close to P c ≃2.5 GPa, there are four kinds of phases, namely, the paramagnetic, superconducting, superconducting and antiferromagnetic, and antiferromagnetic phases in the temperature vs magnetic field phase diagram. The antiferromagnetic phase is found to be induced in the superconducting phase under magnetic fields and expanded in magnetic fields higher than the upper critical field in superconductivity. Interestingly, the anisotropy of the upper critical field in CeRhIn 5 is found to be different from that in a similar non-magnetic heavy-fermion superconductor CeCoIn 5 , revealing the anisotropic paramag...