Model of non-Josephson oscillations in the resistive state of superconducting films

Gurami Alexandrov Gogadze

doi:10.1117/12.241805

10 June 1996 Model of non-Josephson oscillations in the resistive state of superconducting films

Gurami Alexandrov Gogadze

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241805
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

A new mechanism of inelastic quasiparticle scattering in the resistive state of superconducting films (the bremsstrahlung effect) is proposed, which stimulates quantum transitions of quasiparticles (with simultaneous 'photon' emission) from the resonance level (epsilon) ₁ to the edge of the superconductor energy gap (Delta) . The phase slip center (PSC) is simulated with a S-N-S contact, in which the N-layer width is d_N equals 2(1_E(xi) )^1/2 and the electrochemical potentials of the superconducting 'banks' are shifted (1_E is the penetration depth of the longitudinal electric field, (xi) (T) is the coherence length). We believe, that the genesis of the level (epsilon) ₁ is associated with interference effects between quasiparticles scattered by the phase boundaries. Electrons pick up the energy (epsilon) ₁ in the electric PSC field due to the multiple Andreev reflection. On the NS boundary of PSC there exists nonstationary perturbation addition to the order parameter potential with amplitude (delta) approximately (Delta) (Gamma) ^3/2 ((Gamma) is the depairing factor of the superconductor). In terms of model developed the non- Josephson generation effect is only possible in the case of effective overbarrier quasiparticle scattering by (delta) , when the condition (epsilon) ₁ - (Delta) >= (delta) is fulfilled. The generation frequency is found from the condition (epsilon) ₁ - (Delta) equals $HBARw_o on the order of (Delta) (Gamma) ^3/2. This gives the characteristic frequencies w_sn approximately 10 MHz for tin and w_Al approximately MHz for aluminum, which is in good agreement with experiment. The other consequences of the model proposed are discussed, which were supported experimentally.

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Gurami Alexandrov Gogadze "Model of non-Josephson oscillations in the resistive state of superconducting films", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241805

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KEYWORDS

Quasiparticles

Superconductors

Scattering

Electrons

Plasma

Reflection

Tin

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