High- Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations
Abstract
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.
- Authors:
-
- Chinese Academy of Sciences (CAS), Beijing (China)
- Chinese Academy of Sciences (CAS), Beijing (China); Yunnan Univ., Kunming (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Tokyo (Japan)
- Nagoya Univ. (Japan)
- Tsinghua Univ., Beijing (China)
- Yunnan Univ., Kunming (China)
- Univ. of Missouri, Columbia, MO (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1376522
- Alternate Identifier(s):
- OSTI ID: 1350795
- Grant/Contract Number:
- AC05-00OR22725
- Resource 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)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
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., 2017.
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. https://doi.org/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. Fri .
"High- Tc Superconductivity in FeSe at High Pressure: Dominant Hole Carriers and Enhanced Spin Fluctuations". United States. https://doi.org/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 = {Fri Apr 07 00:00:00 EDT 2017},
month = {Fri Apr 07 00:00:00 EDT 2017}
}
Web of Science
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