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Neutron scattering resonance and the iron-pnictide superconducting gap

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [3];  [4]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  2. University of Augsburg (Germany)
  3. University of California, Santa Barbara, CA (United States)
  4. University of Florida, Gainesville, FL (United States)
+ Show Author Affiliations
The existence of a neutron scattering resonance at a wave vector q* implies a sign change of the gap between two Fermi-surface regions separated by wave vector q*. For the Fe pnictides, a resonance has been observed for a wave vector q*which connects a hole Fermi surface around the Γ point with an electron Fermi surface around the X or Y points of the 1 Fe/unit cell Brillouin zone. Here we study the neutron scattering resonance for a five-orbital model within a random-phase approximation—BCS approximation. Furthermore, our results show that both an isotropic sign-switched and an anisotropic extended s-wave gap are consistent with the present data for q* near (π,0) and that scattering at other momentum transfers can be useful in distinguishing between gap structures.
Research Organization:
University of Florida, Gainesville, FL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-05ER46236
OSTI ID:
2484115
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 13 Vol. 79; 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