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We address here the superconductivity quenching under an external magneticfield of amplitudes up to 1 T and in the so-called "thermal smallness"condition, when the microbridge width becomes smaller than the thermaldiffusion length of both the own superconductor and its refrigerant (thesubstrate, in the case of thin films), which breaks their thermal dimensionalscaling. Our results further support that when the current perturbations havecharacteristic times in the millisecond range the quenching is due to thermalinstabilities associated with regular (nonsingular) flux-flow, and they alsosuggest how to optimize the refrigeration of practical superconductors.

New measurements of the transition to the normal state induced by high  current densities in high-Tc superconductor microbridges under thermal  smallness conditions