Details

Autor(en) / Beteiligte

• Mironov, A. Yu
• Silevitch, D. M.
• Postolova, S. V.
• Burdastyh, M. V.
• Proslier, T.
• Baturina, T. I.
• Rosenbaum, T. F.
• Vinokur, V. M.

Titel

Supercapacitance and superinductance of TiN and NbTiN films in the vicinity of superconductor-to-insulator transition

Ist Teil von

• Scientific reports, 2021-08, Vol.11 (1), p.16181-16181, Article 16181

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2021

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Abstract We investigate the low-temperature complex impedance of disordered insulating thin TiN and NbTiN films in the frequency region 400 Hz–1 MHz in close proximity to the superconductor–insulator transition (SIT). The frequency, temperature, and magnetic field dependencies of the real and imaginary parts of the impedance indicate that in full accord with the theoretical predictions and earlier observations, the films acquire self-induced electronic granularity and become effectively random arrays of superconducting granules coupled via Josephson links. Accordingly, the inductive component of the response is due to superconducting droplets, while the capacitive component results from the effective Josephson junctions capacitances. The impedance crosses over from capacitive to inductive behavior as films go across the transition.