Quasiparticle energy relaxation times in NbN/CuNi nanostripes from critical velocity measurements
Abstract
The dynamic instability of the moving vortex lattice at high driving currents in NbN/CuNi-based and NbN nanostripes designed for optical detection has been studied. By applying the model proposed by Larkin and Ovchinnikov [Zh. Eksp. Teor. Fiz. 68, 1915 (1975)], from the critical velocity v* for the occurrence of the instability, it was possible to estimate the values of the quasiparticle relaxation times τE. The results show that the NbN/CuNi-based devices are characterized by shorter values of τE compared to that of NbN.
- Publication:
-
Physical Review B
- Pub Date:
- August 2011
- DOI:
- 10.1103/PhysRevB.84.054536
- Bibcode:
- 2011PhRvB..84e4536C
- Keywords:
-
- 74.45.+c;
- 74.78.Fk;
- 74.40.Gh;
- 85.25.Oj;
- Proximity effects;
- Andreev effect;
- SN and SNS junctions;
- Multilayers superlattices heterostructures;
- Superconducting optical X-ray and gamma-ray detectors