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Title: High- T c Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [3];  [4];  [5];  [6];  [7];  [3];  [4];  [4];  [8];  [1]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China); Yunnan Univ., Kunming (China)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Tokyo (Japan)
  5. Nagoya Univ. (Japan)
  6. Tsinghua Univ., Beijing (China)
  7. Yunnan Univ., Kunming (China)
  8. Univ. of Missouri, Columbia, MO (United States)

The importance of electron-hole interband interactions is widely acknowledged for iron-pnictide superconductors with high transition temperatures (Tc). However, high-Tc superconductivity without hole carriers has been suggested in FeSe single-layer films and intercalated iron-selenides, raising a fundamental question whether iron pnictides and chalcogenides have different pairing mechanisms. Here, we study the properties of electronic structure in another high-Tc phase induced by pressure in bulk FeSe from magneto-transport measurements and first-principles calculations. With increasing pressure, the low-Tc superconducting phase transforms into high-Tc phase, where we find the normal-state Hall resistivity changes sign from negative to positive, demonstrating dominant hole carriers in striking contrast to other FeSe-derived high-Tc systems. Moreover, the Hall coefficient is remarkably enlarged and the magnetoresistance exhibits anomalous scaling behaviours, evidencing strongly enhanced interband spin fluctuations in the high-Tc phase. These results in FeSe highlight similarities with high-Tc phases of iron pnictides, constituting a step toward a unified understanding of iron-based superconductivity.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1376522
Alternate ID(s):
OSTI ID: 1350795
Journal Information:
Physical Review Letters, Vol. 118, Issue 14; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Photoinduced possible superconducting state with long-lived disproportionate band filling in FeSe journal September 2019
Enhancement of superconductivity in FeNb x Se 0.95 by hole carrier doping journal January 2019
Majority carrier type inversion in the FeSe family and a ‘doped semimetal’ scheme in iron-based superconductors journal May 2019
The fabrication of high-quality superconducting FeSe 1−x S x films via pulsed laser deposition journal January 2020
Theory of two-fluid metallicity in superconducting FeSe at high pressure journal September 2019
Extreme anisotropy and anomalous transport properties of heavily electron doped Li x ( NH 3 ) y Fe 2 Se 2 single crystals journal August 2017
Realization of continuous electron doping in bulk iron selenides and identification of a new superconducting zone journal December 2018
Highly-Tunable Crystal Structure and Physical Properties in FeSe-Based Superconductors journal October 2019
Dome of magnetic order inside the nematic phase of sulfur-substituted FeSe under pressure text January 2017
Flux growth in a horizontal configuration: an analogue to vapor transport growth text January 2017
Majority carrier type inversion in FeSe family and "doped semimetal" scheme in iron-based superconductors text January 2018
Synergy and competition between superconductivity and antiferromagnetism in FeSe under pressure text January 2018