title: Coexistence of light and heavy carriers associated with superconductivity and antiferromagnetism in CeNi0.8Bi2 with a Bi square net.
abstract: We found that the ZrCuSiAs-type crystal CeNi(0.8)Bi(2) with a layered structure composed of alternate stacking of [CeNi(x)Bi(1)](δ+) and Bi(2)(δ-) exhibits a superconductive transition at ∼4  K. The conductivities, magnetic susceptibilities, and heat capacities measurements indicate the presence of two types of carriers with notable different masses, i.e., a light electron responsible for superconductivity and a heavy electron interacting with the Ce 4f electron. This observation suggests that 6p electrons of Bi(2) forming the square net and electrons in CeNi(x)Bi(1) layers primarily correspond to the light and heavy electrons, respectively.
authors.affiliation: Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Mizoguchi
authors.forename: Satoru
authors.initials: S
authors.lastname: Matsuishi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Hirano
authors.forename: Makoto
authors.initials: M
authors.lastname: Tachibana
authors.forename: Eiji
authors.initials: E
authors.lastname: Takayama-Muromachi
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kawaji
authors.forename: Hideo
authors.initials: H
authors.lastname: Hosono