Supercapacitance and superinductance of TiN and NbTiN films in the vicinity of superconductor-to-insulator transition
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.
Additional Information
© The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. Received 18 February 2021; Accepted 26 July 2021; Published 10 August 2021. The experimental work in Novosibirsk was supported by the RSF, Project No 18-72-10056 (AYuM, SVP, MVB) The work at Caltech was supported by National Science Foundation Grant No. DMR-1606858 (DMS and TFR). DMS acknowledges support from the US Department of Energy Basic Energy Sciences Award DE-SC0014866. The work by VMV was supported by the Terra Quantum AG. Data availability: The authors declare that all relevant data supporting the findings of this study are available within the article. Additional raw data, if necessary, are available upon request to corresponding author, VMV, vmvinokour@gmail.com. Author Contributions: A.Yu.M., T.I.B., V.M.V., and T.F.R. conceived the project and initiated this work; the films were synthesized by T.P.; A.Yu.M., D.M.S., T.I.B., S.V.P., and M.V.B., carried out the experiments; A.Yu.M., D.M.S., T.I.B., T.F.R., and V.M.V. analyzed the data. All authors discussed the results and contributed in writing the manuscript. The authors declare no competing interests.Attached Files
Published - s41598-021-95530-5.pdf
Supplemental Material - 41598_2021_95530_MOESM1_ESM.pdf
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Additional details
- PMCID
- PMC8355108
- Eprint ID
- 110201
- Resolver ID
- CaltechAUTHORS:20210811-190844403
- 18-72-10056
- Russian Science Foundation
- DMR-1606858
- NSF
- DE-SC0014866
- Department of Energy (DOE)
- Terra Quantum AG
- Created
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2021-08-11Created from EPrint's datestamp field
- Updated
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2023-06-27Created from EPrint's last_modified field