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Effect of magnetic frustration on nematicity and superconductivity in iron chalcogenides

Journal Article · · Nature Physics
DOI:https://doi.org/10.1038/nphys3434· OSTI ID:2496651
 [1];  [1];  [2];  [3];  [4];  [2]
  1. Naval Research Laboratory, Washington, DC (United States)
  2. Goethe-Universität Frankfurt (Germany)
  3. University of Florida, Gainesville, FL (United States)
  4. University of Minnesota, Minneapolis, MN (United States)
Over the past few years iron chalcogenides have been intensively studied as part of the wider family of iron-based superconductors, with many intriguing results reported so far on intercalated and monolayer FeSe. Nevertheless, bulk FeSe itself remains an unusual case when compared with pnictogen-based iron superconductors, and may hold clues to understanding the more exotic derivatives of the FeSe system. The FeSe phase diagram is distinct from the pnictides: the orthorhombic distortion, which is likely to be of a ‘spin-nematic’ nature in numerous pnictides, is not accompanied by magnetic order in FeSe, and the superconducting transition temperature Tc rises significantly with pressure before decreasing. Furthermore we show that the magnetic interactions in FeSe, as opposed to most pnictides, demonstrate an unusual and unanticipated frustration, which suppresses magnetic (but not nematic) order, triggers ferro-orbital order in the nematic phase and can naturally explain the non-monotonic pressure dependence of the superconducting critical temperature Tc(P).
Research Organization:
University of Florida, Gainesville, FL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-05ER46236; SC0012336
OSTI ID:
2496651
Journal Information:
Nature Physics, Journal Name: Nature Physics Journal Issue: 11 Vol. 11; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

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