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Theory of thermal conductivity in extended-$$s$$ state superconductors: Application to ferropnictides

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [1];  [3]
  1. University of Florida, Gainesville, FL (United States)
  2. Montana State University, Bozeman, MT (United States)
  3. Louisiana State University, Baton Rouge, LA (United States)
+ Show Author Affiliations
Within a two-band model for the recently discovered ferropnictide materials, we calculate the thermal conductivity assuming general superconducting states of A1⁢g (“s-wave”) symmetry, considering both currently popular isotropic “sign-changing” s states and states with strong anisotropy, including those which manifest nodes or deep minima of the order parameter. We consider both intraband and interband disorder scattering effects, and show that in situations where a low-temperature linear-T term exists in the thermal conductivity, it is not always “universal” as in d-wave superconductors. We discuss the conditions under which such a term can disappear, as well as how it can be induced by a magnetic field. Here, we compare our results to several recent experiments.
Research Organization:
University of Florida, Gainesville, FL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-05ER46236; FG02-08ER46492
OSTI ID:
2484121
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 22 Vol. 80; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY