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Title: Origin of Pressure-induced Superconducting Phase in K xFe 2-ySe 2 studied by Synchrotron X-ray Diffraction and Spectroscopy

Abstract

Pressure dependence of the electronic and crystal structures of K xFe 2–ySe 2, which has pressure-induced two superconducting domes of SC I and SC II, was investigated by x-ray emission spectroscopy and diffraction. X-ray diffraction data show that compressibility along the c-axis changes around 12 GPa, where a new superconducting phase of SC II appears. This suggests a possible tetragonal to collapsed tetragonal phase transition. X-ray emission spectroscopy data also shows the change in the electronic structure around 12 GPa. These results can be explained by the scenario that the two SC domes under pressure originate from the change of Fermi surface topology. Lastly, our results here show the pronounced increase of the density of states near the Fermi surface under pressure with a structural phase transition, which can help address our fundamental understanding for the appearance of the SC II phase.

Authors:
 [1];  [2];  [3];  [4];  [5];  [3];  [6];  [7];  [7];  [7];  [8];  [8];  [8];  [8];  [1]
  1. Kwansei Gukuin Univ., Hyogo (Japan)
  2. RIKEN SPring-8 Center, Hyogo (Japan)
  3. National Institute for Materials Science, Ibaraki (Japan)
  4. National Institute for Materials Science, Ibaraki (Japan); Tohoku Univ., Miyagi (Japan)
  5. Kwansei Gukuin Univ., Hyogo (Japan); National Institute for Materials Science, Ibaraki (Japan)
  6. The Univ. of Texas at Austin, Austin, TX (United States); Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
  7. Osaka Univ., Osaka (Japan)
  8. National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1388077
Grant/Contract Number:  
SC0001057
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Related Information: EFree partners with Carnegie Institution of Washington (lead); California Institute of Technology; Colorado School of Mines; Cornell University; Lehigh University; Pennsylvania State University; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; catalysis (heterogeneous); solar (photovoltaic); phonons; thermoelectric; energy storage (including batteries and capacitors); hydrogen and fuel cells; superconductivity; charge transport; mesostructured materials; materials and chemistry by design; synthesis (novel materials)

Citation Formats

Yamamoto, Yoshiya, Yamaoka, Hitoshi, Tanaka, Masashi, Okazaki, Hiroyuki, Ozaki, Toshinori, Takano, Yoshihiko, Lin, Jung -Fu, Fujita, Hidenori, Kagayama, Tomoko, Shimizu, Katsuya, Hiraoka, Nozomu, Ishii, Hirofumi, Liao, Yen -Fa, Tsuei, Ku -Ding, and Mizuki, Jun?ichiro. Origin of Pressure-induced Superconducting Phase in KxFe2-ySe2 studied by Synchrotron X-ray Diffraction and Spectroscopy. United States: N. p., 2016. Web. doi:10.1038/srep30946.
Yamamoto, Yoshiya, Yamaoka, Hitoshi, Tanaka, Masashi, Okazaki, Hiroyuki, Ozaki, Toshinori, Takano, Yoshihiko, Lin, Jung -Fu, Fujita, Hidenori, Kagayama, Tomoko, Shimizu, Katsuya, Hiraoka, Nozomu, Ishii, Hirofumi, Liao, Yen -Fa, Tsuei, Ku -Ding, & Mizuki, Jun?ichiro. Origin of Pressure-induced Superconducting Phase in KxFe2-ySe2 studied by Synchrotron X-ray Diffraction and Spectroscopy. United States. doi:10.1038/srep30946.
Yamamoto, Yoshiya, Yamaoka, Hitoshi, Tanaka, Masashi, Okazaki, Hiroyuki, Ozaki, Toshinori, Takano, Yoshihiko, Lin, Jung -Fu, Fujita, Hidenori, Kagayama, Tomoko, Shimizu, Katsuya, Hiraoka, Nozomu, Ishii, Hirofumi, Liao, Yen -Fa, Tsuei, Ku -Ding, and Mizuki, Jun?ichiro. Mon . "Origin of Pressure-induced Superconducting Phase in KxFe2-ySe2 studied by Synchrotron X-ray Diffraction and Spectroscopy". United States. doi:10.1038/srep30946. https://www.osti.gov/servlets/purl/1388077.
@article{osti_1388077,
title = {Origin of Pressure-induced Superconducting Phase in KxFe2-ySe2 studied by Synchrotron X-ray Diffraction and Spectroscopy},
author = {Yamamoto, Yoshiya and Yamaoka, Hitoshi and Tanaka, Masashi and Okazaki, Hiroyuki and Ozaki, Toshinori and Takano, Yoshihiko and Lin, Jung -Fu and Fujita, Hidenori and Kagayama, Tomoko and Shimizu, Katsuya and Hiraoka, Nozomu and Ishii, Hirofumi and Liao, Yen -Fa and Tsuei, Ku -Ding and Mizuki, Jun?ichiro},
abstractNote = {Pressure dependence of the electronic and crystal structures of KxFe2–ySe2, which has pressure-induced two superconducting domes of SC I and SC II, was investigated by x-ray emission spectroscopy and diffraction. X-ray diffraction data show that compressibility along the c-axis changes around 12 GPa, where a new superconducting phase of SC II appears. This suggests a possible tetragonal to collapsed tetragonal phase transition. X-ray emission spectroscopy data also shows the change in the electronic structure around 12 GPa. These results can be explained by the scenario that the two SC domes under pressure originate from the change of Fermi surface topology. Lastly, our results here show the pronounced increase of the density of states near the Fermi surface under pressure with a structural phase transition, which can help address our fundamental understanding for the appearance of the SC II phase.},
doi = {10.1038/srep30946},
journal = {Scientific Reports},
number = 1,
volume = 6,
place = {United States},
year = {2016},
month = {8}
}

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