Campus Units
Physics and Astronomy, Ames Laboratory
Document Type
Article
Publication Version
Published Version
Publication Date
8-1-2016
Journal or Book Title
Physical Review B
Volume
94
Issue
6
First Page
064521
DOI
10.1103/PhysRevB.94.064521
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. 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.
Copyright Owner
American Physical Society
Copyright Date
2016
Language
en
File Format
application/pdf
Recommended Citation
Teknowijoyo, S.; Cho, Kyuil; Tanatar, Makariy A.; Gonzales, J.; Böhmer, Anna E.; Cavani, O.; Mishra, V.; Hirschfeld, P. J.; Bud’ko, Sergey L.; Canfield, Paul C.; and Prozorov, Ruslan, "Enhancement of superconducting transition temperature by pointlike disorder and anisotropic energy gap in FeSe single crystals" (2016). Physics and Astronomy Publications. 551.
https://lib.dr.iastate.edu/physastro_pubs/551
Comments
This article is published as Teknowijoyo, S., K. Cho, M. A. Tanatar, J. Gonzales, A. E. Böhmer, O. Cavani, V. Mishra, P. J. Hirschfeld, S. L. Bud’ko, P. C. Canfield, and R. Prozorov. "Enhancement of superconducting transition temperature by pointlike disorder and anisotropic energy gap in FeSe single crystals." Physical Review B 94, no. 6 (2016): 064521. DOI: 10.1103/PhysRevB.94.064521. Posted with permission.