Enhancement of superconducting transition temperature by pointlike disorder and anisotropic energy gap in FeSe single crystals
Abstract
A highly anisotropic superconducting gap is found in single crystals of FeSe by studying the London penetration depth Δλ measured down to 50 mK in samples before and after 2.5 MeV electron irradiation. The gap minimum increases with introduced pointlike disorder, indicating the absence of symmetry-imposed nodes. Surprisingly, the superconducting transition temperature Tc increases by 0.4 K from Tc0 ≈ 8.8 K while the structural transition temperature Ts decreases by 0.9 K from Ts0 ≈ 91.2 K after electron irradiation. Finally, we discuss several explanations for the Tc enhancement and propose that local strengthening of the pair interaction by irradiation-induced Frenkel defects most likely explains the phenomenon.
- Authors:
-
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Univ. Paris-Saclay, Palaiseau Cedex (France)
- Univ. of Tennessee, Knoxville, TN (United States)
- Univ. of Florida, Gainesville, FL (United States)
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1350069
- Alternate Identifier(s):
- OSTI ID: 1310834
- Report Number(s):
- IS-J-9233
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1701685
- Grant/Contract Number:
- AC02-07CH11358; NSF-DMR-1407502; PD-226
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 94; Journal Issue: 6; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Teknowijoyo, S., Cho, K., Tanatar, M. A., Gonzales, J., Böhmer, A. E., Cavani, O., Mishra, V., Hirschfeld, P. J., Bud'ko, S. L., Canfield, P. C., and Prozorov, R.. Enhancement of superconducting transition temperature by pointlike disorder and anisotropic energy gap in FeSe single crystals. United States: N. p., 2016.
Web. doi:10.1103/PhysRevB.94.064521.
Teknowijoyo, S., Cho, K., Tanatar, M. A., Gonzales, J., Böhmer, A. E., Cavani, O., Mishra, V., Hirschfeld, P. J., Bud'ko, S. L., Canfield, P. C., & Prozorov, R.. Enhancement of superconducting transition temperature by pointlike disorder and anisotropic energy gap in FeSe single crystals. United States. https://doi.org/10.1103/PhysRevB.94.064521
Teknowijoyo, S., Cho, K., Tanatar, M. A., Gonzales, J., Böhmer, A. E., Cavani, O., Mishra, V., Hirschfeld, P. J., Bud'ko, S. L., Canfield, P. C., and Prozorov, R.. Mon .
"Enhancement of superconducting transition temperature by pointlike disorder and anisotropic energy gap in FeSe single crystals". United States. https://doi.org/10.1103/PhysRevB.94.064521. https://www.osti.gov/servlets/purl/1350069.
@article{osti_1350069,
title = {Enhancement of superconducting transition temperature by pointlike disorder and anisotropic energy gap in FeSe single crystals},
author = {Teknowijoyo, S. and Cho, K. and Tanatar, M. A. and Gonzales, J. and Böhmer, A. E. and Cavani, O. and Mishra, V. and Hirschfeld, P. J. and Bud'ko, S. L. and Canfield, P. C. and Prozorov, R.},
abstractNote = {A highly anisotropic superconducting gap is found in single crystals of FeSe by studying the London penetration depth Δλ measured down to 50 mK in samples before and after 2.5 MeV electron irradiation. The gap minimum increases with introduced pointlike disorder, indicating the absence of symmetry-imposed nodes. Surprisingly, the superconducting transition temperature Tc increases by 0.4 K from Tc0 ≈ 8.8 K while the structural transition temperature Ts decreases by 0.9 K from Ts0 ≈ 91.2 K after electron irradiation. Finally, we discuss several explanations for the Tc enhancement and propose that local strengthening of the pair interaction by irradiation-induced Frenkel defects most likely explains the phenomenon.},
doi = {10.1103/PhysRevB.94.064521},
journal = {Physical Review B},
number = 6,
volume = 94,
place = {United States},
year = {Mon Aug 29 00:00:00 EDT 2016},
month = {Mon Aug 29 00:00:00 EDT 2016}
}
Web of Science
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