title: Competitive coexistence of superconductivity with antiferromagnetism in CeRhIn5.
abstract: 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.
authors.affiliation: Department of Physics, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan.
authors.forename: G F
authors.initials: GF
authors.lastname: Chen
authors.forename: K
authors.initials: K
authors.lastname: Matsubayashi
authors.forename: S
authors.initials: S
authors.lastname: Ban
authors.forename: K
authors.initials: K
authors.lastname: Deguchi
authors.forename: N K
authors.initials: NK
authors.lastname: Sato