Evolution of superconductivity in K2–xFe4+ySe5: Spectroscopic studies of X-ray absorption and emission
Abstract
We investigate 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 (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 3d and 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+ySe5 superconductors, providing deeper insight into the electron pairing mechanisms of superconductivity.
- Authors:
-
- National Tsing Hua Univ. (Taiwan)
- Tamkang Univ. (Taiwan)
- Academia Sinica, Taipei (Taiwan); National Univ. of Science and Technology, Taipei (Taiwan)
- Tamkang Univ. (Taiwan); National Synchrotron Radiation Research Center (Taiwan)
- Tamkang Univ. (Taiwan); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- National Univ. of Kaohsiung (Taiwan)
- National Synchrotron Radiation Research Center (Taiwan)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- 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. https://doi.org/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. https://doi.org/10.1073/pnas.1912610116. https://www.osti.gov/servlets/purl/1581386.
@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+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 (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 3d and 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+ySe5 superconductors, 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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