Origin of Pressure-induced Superconducting Phase in KxFe2-ySe2 studied by Synchrotron X-ray Diffraction and Spectroscopy

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

doi:10.1038/srep30946

Origin of Pressure-induced Superconducting Phase in K_xFe_2-ySe₂ studied by Synchrotron X-ray Diffraction and Spectroscopy

Journal Article · Mon Aug 08 00:00:00 EDT 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep30946· OSTI ID:1388077

Yamamoto, Yoshiya ^[1]; Yamaoka, Hitoshi ^[2]; Tanaka, Masashi ^[3]; Okazaki, Hiroyuki ^[4]; Ozaki, Toshinori ^[5]; Takano, Yoshihiko ^[3]; Lin, Jung -Fu ^[6]; Fujita, Hidenori ^[7]; Kagayama, Tomoko ^[7]; Shimizu, Katsuya ^[7]; Hiraoka, Nozomu ^[8]; Ishii, Hirofumi ^[8]; Liao, Yen -Fa ^[8]; Tsuei, Ku -Ding ^[8]; Mizuki, Jun?ichiro ^[1]

Kwansei Gukuin Univ., Hyogo (Japan)
RIKEN SPring-8 Center, Hyogo (Japan)
National Institute for Materials Science, Ibaraki (Japan)
National Institute for Materials Science, Ibaraki (Japan); Tohoku Univ., Miyagi (Japan)
Kwansei Gukuin Univ., Hyogo (Japan); National Institute for Materials Science, Ibaraki (Japan)
The Univ. of Texas at Austin, Austin, TX (United States); Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (China)
Osaka Univ., Osaka (Japan)
National Synchrotron Radiation Research Center, Hsinchu (Taiwan)

Pressure dependence of the electronic and crystal structures of K_xFe_2–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.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0001057

OSTI ID:: 1388077

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Reciprocity between local moments and collective magnetic excitations in the phase diagram of BaFe2(As1−xPx)2 Pelliciari, Jonathan; Ishii, Kenji; Huang, Yaobo Communications Physics, Vol. 2, Issue 1 https://doi.org/10.1038/s42005-019-0236-3	journal	November 2019

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