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Evolution of superconductivity in K2-xFe4+ySe5: Spectroscopic studies of X-ray absorption and emission.
Wang, H T; Ghosh, Anirudha; Wang, C H; Hsieh, S H; Shao, Y C; Chiou, J W; Chen, C L; Pao, C W; Lee, J F; Liu, Y S; Chuang, Y D; Guo, J H; Wu, M K; Pong, W F.
Afiliação
  • Wang HT; Department of Physics, National Tsing Hua University, 30013 Hsinchu, Taiwan.
  • Ghosh A; Department of Physics, Tamkang University, 25137 Tamsui, Taiwan.
  • Wang CH; Institute of Physics, Academia Sinica, 11529 Taipei, Taiwan.
  • Hsieh SH; Department of Electronic and Computer Engineering, National University of Science and Technology, 10607 Taipei, Taiwan.
  • Shao YC; Department of Physics, Tamkang University, 25137 Tamsui, Taiwan.
  • Chiou JW; National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan.
  • Chen CL; Department of Physics, Tamkang University, 25137 Tamsui, Taiwan.
  • Pao CW; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.
  • Lee JF; Department of Applied Physics, National University of Kaohsiung, 81148 Kaohsiung, Taiwan.
  • Liu YS; National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan.
  • Chuang YD; National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan.
  • Guo JH; National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan.
  • Wu MK; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.
  • Pong WF; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720.
Proc Natl Acad Sci U S A ; 116(45): 22458-22463, 2019 Nov 05.
Article em En | MEDLINE | ID: mdl-31641068
ABSTRACT
This study investigates the evolution of superconductivity in K2-xFe4+ySe5 using temperature-dependent X-ray absorption and resonant inelastic X-ray scattering techniques. Magnetization measurements show that polycrystalline superconducting (SC) K1.9Fe4.2Se5 has a critical temperature (T c) of ∼31 K with a varying superconducting volume fraction, which strongly depends on its synthesis temperature. An increase in Fe-structural/vacancy disorder in SC samples with more Fe atoms occupying vacant 4d sites is found to be closely related to the decrease in the spin magnetic moment of Fe. Moreover, the nearest-neighbor Fe-Se bond length in SC samples exceeds that in the non-SC (NS) sample, K2Fe4Se5, which indicates a weaker hybridization between the Fe 3d and Se 4p states in SC samples. These results clearly demonstrate the correlations among the local electronic and atomic structures and the magnetic properties of K2-xFe4+ySe5 superconductors, providing deeper insight into the electron pairing mechanisms of superconductivity.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2019 Tipo de documento: Article