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Superconducting Critical Fluctuations in Strong Electric Fields

Authors/others:Puica, IonutLang, Wolfgang
Abstract:The non-Ohmic effect of a high electric field on both the longitudinal and transverse magneto-transport properties of a layered superconductor near the superconducting transition is studied in the frame of the Langevin approach to the time-dependent Ginzburg-Landau equation. The in-plane and the out-of-plane fluctuation conductivities, the excess Hall conductivity and the fluctuation Ettingshausen coefficient are computed in the self-consistent Hartree approximation for an arbitrarily strong electric field and a magnetic field perpendicular to the layers. Our results indicate that high electric fields can be effectively used to suppress order-parameter fluctuations in hightemperature superconductors and the similarity with the transition broadening under strong magnetic fields is pointed out. The simultaneous application of the two fields results in a slightly stronger suppression of the superconducting fluctuation in-plane conductivity, compared to the case when the fields are applied individually, while the relative suppression of the excess Hall conductivity turns out to be stronger than for the paraconductivity. An important suppression of the Ettingshausen effect due to the high electric field, much stronger than the effect of the magnetic field alone, is also predicted. A supplementary broadening of the transition induced by a strong electric field is found also for the out-of-plane resistivity, although the transverse conduction appears to be stronger affected by the magnetic than by the electric field. The corresponding expressions of the non-Ohmic transport properties for the two-dimensional and three-dimensional cases are also inferred, and the effect of the magnetic field orientation for an anisotropic bulk material is discussed.
Number of pages:36
Date of publication:2007
Bibliographical note:Host publication data : HerausgeberInnen ergänzen; (2007): Superconductivity Research Horizons, Nova Science Publishers, Inc.
Publication Type:Chapter
Host publication's title:Superconductivity Research Horizons
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