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RESEARCH PRODUCT
Low-Frequency Imaginary Impedance at the Superconducting Transition of 2H - NbSe2
Isabel GuillamónIsabel GuillamónEugenio CoronadoDavid PerconteHermann SuderowHermann SuderowSamuel Mañas‐valerosubject
SuperconductivityPhysicsResistive touchscreenCondensed matter physicsGeneral Physics and Astronomy02 engineering and technologyLow frequency021001 nanoscience & nanotechnology01 natural sciencesMagnetic fieldVortexCondensed Matter::Superconductivity0103 physical sciencesThermalQuasiparticle010306 general physics0210 nano-technologyElectrical impedancedescription
The superconducting transition leads to a sharp resistance drop in a temperature interval that can be a small fraction of the critical temperature ${T}_{c}$. A superconductor exactly at ${T}_{c}$ is thus very sensitive to all kinds of thermal perturbation, including the heat dissipated by the measurement current. We show that the interaction between electrical and thermal currents leads to a sizable imaginary impedance at frequencies of the order of tens of hertz at the resistive transition of single crystals of the layered material $2H$-${\mathrm{Nb}\mathrm{Se}}_{2}$. We explain the result using models developed for transition-edge sensors. By measuring under magnetic fields and at high currents, we find that the imaginary impedance is strongly influenced by the heat associated with vortex motion and out-of-equilibrium quasiparticles.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-05-18 | Physical Review Applied |