Stability limits of flux states in two-band superconductor rings
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This study explores transitions between states with different winding number in two-band superconducting rings. From the time-dependent Ginzburg-Landau equations for two-component superconductors, we apply linear instability theory and develop a semianalytical method that provides the critical flux for phase-slip occurrence. The developed method was applied to investigate how the critical flux depends on physical properties, such as band parameters and temperature. Finally, we show the possible existence of a soliton state, in which the phase winding number is different in each condensate.
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Physical Review B, v. 110, n. 14, 2024.
