Coexistence of superconductivity and antiferromagnetic ordering in the layered superconductor SmFePO

Yoichi Kamihara, Hidenori Hiramatsu, Masahiro Hirano, Yasuhiro Kobayashi, Shinji Kitao, Satoshi Higashitaniguchi, Yoshitaka Yoda, Makoto Seto, and Hideo Hosono

Phys. Rev. B 78, 184512 – Published 18 November 2008

Abstract

Superconductivity and magnetic transition in SmFePO were examined by electric, magnetic, ${}^{57}F e$ Mössbauer, and ${}^{149}S m$ nuclear resonant forward-scattering (NRFS) measurements. Zero resistivity and negative magnetic susceptibility were observed in an undoped SmFePO, indicating superconducting transition temperature $(T_{c})$ of $\sim 3 K$ . $T_{c}$ in undoped SmFePO appears in a narrow region of lattice constants with an optimum conductivity. Furthermore, in relation to magnetic susceptibility, NRFS spectra verify that magnetic moments of ${Sm}^{3 +}$ ions order antiferromagnetically below magnetic transition $\sim 5 K$ , accompanying a discontinuous drop in electrical resistivity, whereas ${}^{57}F e$ Mössbauer spectra show that magnetic moments of Fe are quenched. These results indicate the coexistence of superconductivity and magnetic ordering in a crystallographic unit cell of SmFePO.

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Received 1 October 2008

DOI:https://doi.org/10.1103/PhysRevB.78.184512

Authors & Affiliations

Yoichi Kamihara^1,*, Hidenori Hiramatsu¹, Masahiro Hirano^1,2, Yasuhiro Kobayashi^3,4, Shinji Kitao^3,4, Satoshi Higashitaniguchi^3,4, Yoshitaka Yoda^4,5, Makoto Seto^3,4,6, and Hideo Hosono^1,2,7

¹ERATO-SORST, JST, Frontier Research Center, Tokyo Institute of Technology, Mail Box S2-13, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
²Frontier Research Center, Tokyo Institute of Technology, Mail Box S2-13, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
³Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan
⁴CREST, JST, Honcho, Kawaguchi, Saitama 332-0012, Japan
⁵Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan
⁶Japan Atomic Energy Agency, 1-1-1 Koto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
⁷Materials and Structures Laboratory, Tokyo Institute of Technology, Mail Box R3-1, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan

^*Present address: Japan Science and Technology Agency, TRiP, Materials and Structures Laboratory, Tokyo Institute of Technology, Mail Box S2-13, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.

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Issue

Vol. 78, Iss. 18 — 1 November 2008

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covering condensed matter and materials physics