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

The importance of electron-hole interband interactions is widely acknowledged for iron-pnictide superconductors with high transition temperatures (T c). However, high-T c 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-T c phase induced by pressure in bulk FeSe from magneto-transport measurements and first-principles calculations. With increasing pressure, the low-T c superconducting phase transforms into high-T c 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-T c systems. Moreover, the Hall coefficient is remarkably enlarged and the magnetoresistance exhibits anomalous scaling behaviours, evidencing strongly enhanced interband spin fluctuations in the high-T c phase. These results in FeSe highlight similarities with high-T c phases of iron pnictides, constituting a step toward a unified understanding of iron-based superconductivity.
Authors:
 [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)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 14; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1376522
Alternate Identifier(s):
OSTI ID: 1350795

Sun, J. P., Ye, G. Z., Shahi, P., Yan, J. -Q., Matsuura, K., Kontani, H., Zhang, G. M., Zhou, Q., Sales, B. C., Shibauchi, T., Uwatoko, Y., Singh, D. J., and Cheng, J. -G.. High- Tc Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations. United States: N. p., Web. doi:10.1103/PhysRevLett.118.147004.
Sun, J. P., Ye, G. Z., Shahi, P., Yan, J. -Q., Matsuura, K., Kontani, H., Zhang, G. M., Zhou, Q., Sales, B. C., Shibauchi, T., Uwatoko, Y., Singh, D. J., & Cheng, J. -G.. High- Tc Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations. United States. doi:10.1103/PhysRevLett.118.147004.
Sun, J. P., Ye, G. Z., Shahi, P., Yan, J. -Q., Matsuura, K., Kontani, H., Zhang, G. M., Zhou, Q., Sales, B. C., Shibauchi, T., Uwatoko, Y., Singh, D. J., and Cheng, J. -G.. 2017. "High- Tc Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations". United States. doi:10.1103/PhysRevLett.118.147004. https://www.osti.gov/servlets/purl/1376522.
@article{osti_1376522,
title = {High- Tc Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations},
author = {Sun, J. P. and Ye, G. Z. and Shahi, P. and Yan, J. -Q. and Matsuura, K. and Kontani, H. and Zhang, G. M. and Zhou, Q. and Sales, B. C. and Shibauchi, T. and Uwatoko, Y. and Singh, D. J. and Cheng, J. -G.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.118.147004},
journal = {Physical Review Letters},
number = 14,
volume = 118,
place = {United States},
year = {2017},
month = {4}
}