Electronic and magnetic phase diagram of superconductors, SmFeAsO 1-xFx

Yoichi Kamihara, Takatoshi Nomura, Masahiro Hirano, Jung Eun Kim, Kenichi Kato, Masaki Takata, Yasuhiro Kobayashi, Shinji Kitao, Satoshi Higashitaniguchi, Yoshitaka Yoda, Makoto Seto, Hideo Hosono

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Abstract

A crystallographic and magnetic phase diagram of SmFeAsO 1-xFx is determined as a function of x in terms of temperature based on electrical transport and magnetization, synchrotron powder x-ray diffraction, 57Fe Mössbauer spectra (MS), and 149Sm nuclear resonant forward scattering (NRFS) measurements. MS revealed that the magnetic moments of Fe were aligned antiferromagnetically at ~144 K (TN(Fe)). The magnetic moment of Fe (MFe) is estimated to be 0.34 μB/Fe at 4.2 K for undoped SmFeAsO; MFe is quenched in superconducting F-doped SmFeAsO. 149Sm NRFS spectra revealed that the magnetic moments of Sm start to order antiferromagnetically at 5.6 K (undoped) and 4.4 K (TN(Sm)) (x = 0.069). Results clearly indicate that the antiferromagnetic (AF) Sm sublattice coexists with the superconducting phase in SmFeAsO1-xFx below T N(Sm), while the AF Fe sublattice does not coexist with the superconducting phase.

Original languageEnglish
Article number033005
JournalNew Journal of Physics
Volume12
DOIs
Publication statusPublished - 2010 Mar 5
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kamihara, Y., Nomura, T., Hirano, M., Kim, J. E., Kato, K., Takata, M., Kobayashi, Y., Kitao, S., Higashitaniguchi, S., Yoda, Y., Seto, M., & Hosono, H. (2010). Electronic and magnetic phase diagram of superconductors, SmFeAsO 1-xFx. New Journal of Physics, 12, [033005]. https://doi.org/10.1088/1367-2630/12/3/033005