Hot-spot formation in stacks of intrinsic Josephson junctions in Bi2Sr2CaCu2O8
B. Gross, S. Guenon, J. Yuan, M.Y. Li, J. Li, A. Iishi, R.G. Mints, T., Hatano, P.H. Wu, D. Koelle, H.B. Wang, R. Kleiner
TL;DR
This study investigates hot-spot formation in stacks of intrinsic Josephson junctions in BSCCO, revealing that negative temperature coefficient of resistivity causes hot spots that can be below or above Tc, supported by experiments and simulations.
Contribution
It provides combined experimental and numerical analysis of hot-spot formation in BSCCO Josephson junction stacks, highlighting the role of resistivity temperature dependence.
Findings
Hot spots form mainly due to negative resistivity temperature coefficient.
Maximum hot spot temperature can be below or above Tc.
Numerical simulations agree well with experimental results.
Abstract
We have studied experimentally and numerically temperature profiles and the formation of hot spots in intrinsic Josephson junction stacks in Bi2Sr2CaCu2O8 (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 Tc. The numerical simulations are in good agreement with the experimental observations.
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