Effects of two gaps and paramagnetic pair breaking on the upper critical field of SmFeAsO0.85 and SmFeAsO0.8F0.2 single crystals
SCIE
SCOPUS
- Title
- Effects of two gaps and paramagnetic pair breaking on the upper critical field of SmFeAsO0.85 and SmFeAsO0.8F0.2 single crystals
- Authors
- Lee, HS; Bartkowiak, M; Park, JH; Lee, JY; Kim, JY; Sung, NH; Cho, BK; Jung, CU; Kim, JS; Lee, HJ
- Date Issued
- 2009-10
- Publisher
- American Physical Soceity
- Abstract
- We investigated the temperature dependence of the upper critical field [H-c2(T)] of fluorine-free SmFeAsO0.85 and fluorine-doped SmFeAsO0.8F0.2 single crystals by measuring the resistive transition in low static magnetic fields and in pulsed fields up to 60 T. Both crystals show that H-c2(T)'s along the c axis [H-c2(c)(T)] and in an ab-planar direction [H-c2(ab)(T)] exhibit a linear and a sublinear increase, respectively, with decreasing temperature below the superconducting transition. H-c2(T)'s in both directions deviate from the conventional one-gap Werthamer-Helfand-Hohenberg theoretical prediction at low temperatures. A two-gap nature and the paramagnetic pair-breaking effect are shown to be responsible for the temperature-dependent behavior of H-c2(c) and H-c2(ab), respectively.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/26373
- DOI
- 10.1103/PhysRevB.80.144512
- ISSN
- 1098-0121
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 80, no. 14, 2009-10
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