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Critical viscosity of a fluctuating superconductor

Journal Article · · Physical Review. B
 [1];  [2]
  1. Univ. of Maryland, College Park, MD (United States); DOE/OSTI
  2. Univ. of Maryland, College Park, MD (United States)
We consider a fluctuating superconductor in the vicinity of the transition temperature, Tc. The fluctuation shear viscosity is calculated. In two dimensions, the leading correction to viscosity is negative and scales as δη(T) ∝ ln(T–Tc). Critical hydrodynamics of the fluctuating superconductor involves two fluids: a fluid of fluctuating pairs and a quasiparticle fluid of single-electron excitations. The pair viscosity (Aslamazov-Larkin) term is shown to be zero. The (density of states) correction to viscosity of single-electron excitations is negative, which is due to fluctuating pairing that results in a reduction of electron density. Scattering of electrons off of the fluctuations gives rise to an enhanced quasiparticle scattering and another (Maki-Thomson) negative correction to viscosity. Furthermore, our results suggest that fluctuating superconductors provide a promising platform to investigate low-viscosity electronic media and may potentially host fermionic/electronic turbulence. Some experimental probes of two-fluid critical hydrodynamics are proposed such as time-of-flight measurement of turbulent energy cascades in critical cold atom superfluids and magnetic dynamos in three-dimensional fluctuating superconductors.
Research Organization:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001911
OSTI ID:
1610589
Alternate ID(s):
OSTI ID: 1546842
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 6 Vol. 100; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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