Paraconductivity of pseudogapped superconductors
Igor Poboiko, Mikhail Feigel'man
DOI 10.1103/PhysRevB.97.014506 · Physical Review B
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Abstract
We calculate Aslamazov-Larkin (AL) paraconductity σAL(T) for a model of strongly disordered superconductors (dimensions d=2,3) with a large pseudogap whose magnitude strongly exceeds transition temperature Tc. We show that, within Gaussian approximation over Cooper-pair fluctuations, paraconductivity is just twice larger that the classical AL result at the same ε=(T−Tc)/Tc. Upon decreasing ε, Gaussian approximation is violated due to local fluctuations of pairing fields that become relevant at ε≤ε1≪1. Characteristic scale ε1 is much larger than the width ε2 of the thermodynamical critical region, that is determined via the Ginzburg criterion, ε2≈ε1d. We argue that in the intermediate region ε2≤ε≤ε1, paraconductivity follows the same AL power law, albeit with another (yet unknown) numerical prefactor. At further decrease of the temperature, all kinds of fluctuational corrections become strong at ε≤ε2; in particular, conductivity occurs to be strongly inhomogeneous in real space.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| InOx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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