Fast vortex dynamics and relaxation times in NbRe-based heterostructures

• Francesco De Chiara,
• Zahra Makhdoumi Kakhaki,
• Francesco Avitabile,
• Francesco Colangelo,
• Abhishek Kumar,
• Carmine Attanasio and
• Carla Cirillo

Beilstein J. Nanotechnol. 2026, 17, 292–302, doi:10.3762/bjnano.17.20

• bilayers, having a relaxation time one order of magnitude smaller than values reported in NbRe microbridges, have great potential for the realization of devices where fast relaxation processes are required. Keywords: flux-flow instability; quasiparticle relaxation time; superconducting heterostructures

• the onset of the instability to the maximum value of vortex velocity, v*, and the quasiparticle relaxation time, τE. The latter characterizes how efficiently quasiparticles (unpaired electrons) return to their equilibrium state from a non-equilibrium one [9]. τE represents a key parameter for the

• the flux-flow instability is strongly influenced by the quality of the sample edges, the estimation of an intrinsic quasiparticle relaxation time from Equation 1 is justified only when the field dependence of the critical current evidences a dominant edge-barrier pinning mechanism. In this regime, the