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

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

doi:10.1038/s41598-021-95530-5

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

Journal Article · Tue Aug 10 00:00:00 EDT 2021 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-021-95530-5· OSTI ID:1816666

Mironov, A. Yu. ^[1]; Silevitch, D. M. ^[2]; Postolova, S. V. ^[3]; Burdastyh, M. V. ^[4]; Proslier, T. ^[5]; Baturina, T. I. ^[3]; Rosenbaum, T. F. ^[6]; Vinokur, V. M. ^[7]

Rzhanov Inst. of Semiconductor Physics, Novosibirsk (Russian Federation); OSTI
California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Physics, Mathematics, and Astronomy
Rzhanov Inst. of Semiconductor Physics, Novosibirsk (Russian Federation)
Rzhanov Inst. of Semiconductor Physics, Novosibirsk (Russian Federation); Novosibirsk State Univ. (Russian Federation).
Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA-Saclay), Gif-sur-Yvette (France). Institut de Recherches sur les lois Fundamentales de L’univers
California Institute of Technology (CalTech), Pasadena, CA (United States). Division of Physics, Mathematics, and Astronomy
Terra Quantum AG, Rorschach (Switzerland); City College of New York, NY (United States). Physics Dept.

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.

View Accepted Manuscript (DOE)

Research Organization:: California Institute of Technology (CalTech), Pasadena, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014866

OSTI ID:: 1816666

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 11; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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