Nanopattern-stimulated superconductor-insulator transition in thin TiN films.
- Materials Science Division
We present the results of the comparative study of transport properties of continuous and nanoperforated TiN films, enabling us to separate the disorder and the geometry effects. Nanopatterning transforms a thin TiN film into an array of superconducting weak links and eo ipso stimulates the disorder- and magnetic-field-driven superconductor-to-insulator transitions, shifting both transitions to a lower degree of microscopic disorder. We observe magnetoresistance oscillations reflecting collective phase-frustration behaviour of the multiconnected superconducting weak link network in a wide range of temperatures. We find that nanopatterning enhances the role of the two-dimensional Coulomb interaction and changes the characteristic energies of the film on length scales significantly larger than the mean free path or the superconducting coherence length.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; Russian Academy of Sciences; Russian Foundation for Basic Research
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1013333
- Report Number(s):
- ANL/MSD/JA-69986
- Journal Information:
- Europhys. Lett., Journal Name: Europhys. Lett. Journal Issue: 4 ; Feb. 2011 Vol. 93; ISSN 0295-5075
- Country of Publication:
- United States
- Language:
- ENGLISH
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