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Title: Evolution of superconductivity in K 2–xFe 4+ySe 5: Spectroscopic studies of X-ray absorption and emission

Abstract

We investigate the evolution of superconductivity in K 2–xFe 4+ySe 5using temperature-dependent X-ray absorption and resonant inelastic X-ray scattering techniques. Magnetization measurements show that polycrystalline superconducting (SC) K 1.9Fe 4.2Se 5has a critical temperature ( T c) of ~31 K with a varying superconducting volume fraction, which significantly 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, K 2Fe 4Se 5, which indicates a weaker hybridization between the Fe 3 dand Se 4 pstates in SC samples. These results clearly demonstrate the correlations among the local electronic and atomic structures and the magnetic properties of K 2–xFe 4+ySe 5superconductors, providing deeper insight into the electron pairing mechanisms of superconductivity.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [7];  [7];  [8];  [8]; ORCiD logo [8];  [9];  [2]
  1. National Tsing Hua Univ. (Taiwan)
  2. Tamkang Univ. (Taiwan)
  3. Academia Sinica, Taipei (Taiwan); National Univ. of Science and Technology, Taipei (Taiwan)
  4. Tamkang Univ. (Taiwan); National Synchrotron Radiation Research Center (Taiwan)
  5. Tamkang Univ. (Taiwan); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. National Univ. of Kaohsiung (Taiwan)
  7. National Synchrotron Radiation Research Center (Taiwan)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  9. National Tsing Hua Univ. (Taiwan); Academia Sinica, Taipei (Taiwan)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1581386
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 116; Journal Issue: 45; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconductivity; Fe vacancy disorder; X-ray absorption spectroscopy; resonant inelastic X-ray scattering

Citation Formats

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., and Pong, W. F. Evolution of superconductivity in K2–xFe4+ySe5: Spectroscopic studies of X-ray absorption and emission. United States: N. p., 2019. Web. doi:10.1073/pnas.1912610116.
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. Evolution of superconductivity in K2–xFe4+ySe5: Spectroscopic studies of X-ray absorption and emission. United States. doi:10.1073/pnas.1912610116.
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., and Pong, W. F. Tue . "Evolution of superconductivity in K2–xFe4+ySe5: Spectroscopic studies of X-ray absorption and emission". United States. doi:10.1073/pnas.1912610116.
@article{osti_1581386,
title = {Evolution of superconductivity in K2–xFe4+ySe5: Spectroscopic studies of X-ray absorption and emission},
author = {Wang, H. T. and Ghosh, Anirudha and Wang, C. H. and Hsieh, S. H. and Shao, Y. C. and Chiou, J. W. and Chen, C. L. and Pao, C. W. and Lee, J. F. and Liu, Y. S. and Chuang, Y. D. and Guo, J. H. and Wu, M. K. and Pong, W. F.},
abstractNote = {We investigate the evolution of superconductivity in K2–xFe4+ySe5using temperature-dependent X-ray absorption and resonant inelastic X-ray scattering techniques. Magnetization measurements show that polycrystalline superconducting (SC) K1.9Fe4.2Se5has a critical temperature (Tc) of ~31 K with a varying superconducting volume fraction, which significantly 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 3dand Se 4pstates in SC samples. These results clearly demonstrate the correlations among the local electronic and atomic structures and the magnetic properties of K2–xFe4+ySe5superconductors, providing deeper insight into the electron pairing mechanisms of superconductivity.},
doi = {10.1073/pnas.1912610116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 45,
volume = 116,
place = {United States},
year = {2019},
month = {11}
}

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