Thermal propagation and stability in superconducting films

K E Gray, R T Kampwirth, J f Zasadzinski, S P Ducharme
1983 Journal of Physics F Metal Physics  
Thermal propagation and stable hot spots (normal domains) are studied in various high T, superconducting films (NblSn, Nb, NbN and NbjGe). The prediction of the thermal propagation velocity of the long-standing model of Broom and Rhoderick is verified quantitatively in the regime of its validity. A new energy balance model is shown to give reasonable quantitative agreement of the dependence of the propagation velocity on the length of short normal domains. The steady state (zero velocity)
more » ... ements indicate the existence of two distinct situations for films on high thermal conductivity (sapphire) substrates. For low power per unit area the film and substrate have the same temperature, and the thermal properties of the substrate dominate. However, for higher power densities in short hot spots, the coupling is relatively weak and the thermal properties of the film alone are important. Here a connection is made between the critical current stability of superconducting films and a critical hot spot size for thermal propagation. As a result efficient heat removal is shown to dominate the stabilisation of superconducting films. The strong and weak coupling situations also lead to modifications of the models for propagation velocities on sapphire substrates. These models are used to explain quantitatively self-healing of hot spots and a curious switching phenomena in a superconducting film in which a hot spot grows and collapses repeatedly over a very narrow range of current. Finally there is a discussion of the potential use of the thermal propagation model in applications of superconductors, especially switches.
doi:10.1088/0305-4608/13/2/017 fatcat:yy2rxfhvfvchfa4d37bvvmn23u