title: Nickel-based oxyphosphide superconductor with a layered crystal structure, LaNiOP.
abstract: A layered oxyphosphide, LaNiOP, was synthesized by solid-state reactions. This crystal was confirmed to have a layered structure composed of an alternating stack of (La(3+)O(2-))(+) and (Ni(2+)P(3-))(-). We found that the resulting LaNiOP shows a superconducting transition at approximately 3 K. This material exhibited metallic conduction and Pauli paramagnetism in the temperature range of 4-300 K. The resistivity sharply dropped to zero and the magnetic susceptibility became negative at <4 K, indicating that a superconducting transition occurs. The volume fraction of the superconducting phase estimated from the diamagnetic susceptibility reached approximately 40 vol % at 1.8 K, substantiating that LaNiOP is a bulk superconductor.
authors: Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, Japan.
authors: Takumi
authors: T
authors: Watanabe
authors: Hiroshi
authors: H
authors: Yanagi
authors: Toshio
authors: T
authors: Kamiya
authors: Yoichi
authors: Y
authors: Kamihara
authors: Hidenori
authors: H
authors: Hiramatsu
authors: Masahiro
authors: M
authors: Hirano
authors: Hideo
authors: H
authors: Hosono