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Anisotropic quasiparticle lifetimes in Fe-based superconductors

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [3];  [4];  [4];  [1]
  1. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford University, CA (United States); University of Florida, Gainesville, FL (United States)
  2. University of Florida, Gainesville, FL (United States); Siberian Branch of Russian Academy of Sciences, Krasnoyarsk (Russia)
  3. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford University, CA (United States)
  4. University of Florida, Gainesville, FL (United States)
+ Show Author Affiliations

We study the dynamical quasiparticle scattering by spin and charge fluctuations in Fe-based pnictides within a five-orbital model with on-site interactions. Here, the leading contribution to the scattering rate is calculated from the second-order diagrams with the polarization operator calculated in the random-phase approximation. We find one-particle scattering rates which are highly anisotropic on each Fermi surface sheet due to the momentum dependence of the spin susceptibility and the multiorbital composition of each Fermi pocket. This fact, combined with the anisotropy of the effective mass, produces disparity between electrons and holes in conductivity, the Hall coefficient, and the Raman initial slope, in qualitative agreement with experimental data.

Research Organization:
University of Florida, Gainesville, FL (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; FG02-02ER45995; FG02-05ER46236
OSTI ID:
2484130
Alternate ID(s):
OSTI ID: 1099444
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 18 Vol. 83; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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75 CONDENSED MATTER PHYSICS
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