Chen G F, Matsubayashi K, Ban S, Deguchi K, Sato N K
Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan.
Phys Rev Lett. 2006 Jul 7;97(1):017005. doi: 10.1103/PhysRevLett.97.017005.
We carried out ac magnetic susceptibility measurements under pressures P on the heavy fermion antiferromagnet CeRhIn5. We report bulk superconductivity (SC) at ambient pressure with a transition temperature Tc approximately or equal to 90 mK. The degraded SC in a powdered or polished sample was restored by annealing, showing that the SC state is sensitive to inhomogeneity. In a coexistence region of the SC with antiferromagnetism (AF), we find that Tc(P)(n)TN(P)(1-n) = const where TN indicates a Néel temperature and n denotes a ratio of electronic specific heat coefficients below and above TN, indicating the competition of the SC and the AF for states at the Fermi surface.
我们在压力P下对重费米子反铁磁体CeRhIn5进行了交流磁化率测量。我们报告了在环境压力下的体超导（SC），其转变温度Tc约为或等于90 mK。粉末状或抛光样品中退化的超导通过退火得以恢复，这表明超导态对不均匀性敏感。在超导与反铁磁性（AF）的共存区域，我们发现Tc(P)(n)TN(P)(1 - n) = 常数，其中TN表示奈尔温度，n表示低于和高于TN的电子比热系数之比，这表明超导和反铁磁在费米面态上存在竞争。
