Nickel-based layered superconductor, LaNiOAs
Takumi Watanabe, Hiroshi Yanagi, Yoichi Kamihara, Toshio Kamiya,, Masahiro Hirano, Hideo Hosono
TL;DR
This paper reports the discovery and characterization of a new layered superconductor, LaNiOAs, which exhibits superconductivity at 2.4 K and has a layered tetragonal structure.
Contribution
It introduces LaNiOAs as a new layered superconductor with detailed structural and physical property analysis.
Findings
LaNiOAs has a tetragonal ZrCuSiAs-type structure.
LaNiOAs exhibits superconductivity at 2.4 K.
LaNiOAs shows metallic conduction and Pauli paramagnetism.
Abstract
Rietveld analysis of the powder X-ray diffraction of a new layered oxyarsenide, LaNiOAs, which was synthesized by solid-state reactions, revealed that LaNiOAs belongs to the tetragonal ZrCuSiAs-type structure (P4/nmm) and is composed of alternating stacks of La-O and Ni-As layers. The electrical and magnetic measurements demonstrated that LaNiOAs exhibits a superconducting transition at 2.4 K, and above this, LaNiOAs shows metallic conduction and Pauli paramagnetism. The diamagnetic susceptibility measured at 1.8 K corresponded to ~20% of perfect diamagnetic susceptibility, substantiating that LaNiOAs is a bulk superconductor.
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