Quasiparticle energy relaxation times in NbN/CuNi nanostripes from critical velocity measurements

C. Cirillo, V. Pagliarulo, H. Myoren, C. Bonavolontà, L. Parlato, G. P. Pepe, and C. Attanasio

Phys. Rev. B 84, 054536 – Published 15 August 2011

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 $τ_{E}$ . The results show that the NbN/CuNi-based devices are characterized by shorter values of $τ_{E}$ compared to that of NbN.

Received 9 May 2011

DOI:https://doi.org/10.1103/PhysRevB.84.054536

Authors & Affiliations

C. Cirillo¹, V. Pagliarulo², H. Myoren³, C. Bonavolontà², L. Parlato², G. P. Pepe², and C. Attanasio^1,*

¹CNR-SPIN Salerno and Dipartimento di Fisica “E. R. Caianiello”, Università degli Studi di Salerno, Fisciano (Sa) I-84084, Italy
²CNR-SPIN Napoli and Dipartimento Scienze Fisiche, Università di Napoli Federico II, Facoltà di Ingegneria, I-80125 Napoli, Italy
³Graduate School of Science and Engineering, Saitama University, 338-8570 Saitama, Japan

^*Corresponding author: attanasio@sa.infn.it

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Vol. 84, Iss. 5 — 1 August 2011

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