We have studied experimentally and numerically temperature profiles and the formation of hot spots in intrinsic Josephson junction stacks in Bi 2Sr 2CaCu 2O 8 (BSCCO). The superconducting stacks are biased in a state where all junctions are resistive. The formation of hot spots in this system is shown to arise mainly from the strongly negative temperature coefficient of the c-axis resistivity of BSCCO at low temperatures. This leads to situations where the maximum temperature in the hot spot can be below or above the superconducting transition temperature T c. The numerical simulations are in good agreement with the experimental observations.
|Physical Review B - Condensed Matter and Materials Physics
|Published - 26 Sep 2012