Physics
Anisotropic upper critical field and possible Fulde-Ferrel-Larkin- Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs
Document Type
Article
Abstract
Measurements of the temperature and angular dependencies of the upper critical field Hc2 of a stoichiometric single crystal LiFeAs in pulsed magnetic fields up to 50 T were performed using a tunnel diode resonator. Complete Hc(T) and Hc2(T) functions with Hc(0)=17±1 T, Hc2(0)=26±1 T, and the anisotropy parameter γH(T)Hc2/Hc decreasing from 2.5 at Tc to 1.5 at TTc were obtained. The results for both orientations are in excellent agreement with a theory of Hc2 for two-band s± pairing in the clean limit. We show that Hc(T) is mostly limited by the orbital pair breaking, whereas the shape of Hc2(T) indicates strong paramagnetic Pauli limiting and the inhomogeneous Fulde-Ferrel-Larkin-Ovchinnikov state below TF~5 K. © 2011 American Physical Society.
Publication Title
Physical Review B - Condensed Matter and Materials Physics
Publication Date
2-11-2011
Volume
83
Issue
6
ISSN
1098-0121
DOI
10.1103/PhysRevB.83.060502
Keywords
superconductivity, magnetic fields
Repository Citation
Cho, K.; Kim, H.; Tanatar, M. A.; Song, Y. J.; Kwon, Y. S.; Coniglio, W. A.; Agosta, C. C.; Gurevich, A.; and Prozorov, R., "Anisotropic upper critical field and possible Fulde-Ferrel-Larkin- Ovchinnikov state in the stoichiometric pnictide superconductor LiFeAs" (2011). Physics. 25.
https://commons.clarku.edu/faculty_physics/25
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