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- Title
Dimension Effects in Insulating NbTiN Disordered Films and the Asymptotic Freedom of Cooper Pairs.
- Authors
Burdastyh, M. V.; Postolova, S. V.; Derbezov, I. A.; Gaisler, A. V.; Diamantini, M. C.; Trugenberger, C. A.; Vinokur, V. M.; Mironov, A. Yu.
- Abstract
We investigate the evolution of the electronic transport in disordered NbTiN films at the insulating side of the superconductor-insulator transition as function of the effective system size along the current direction. We demonstrate that both, the threshold voltage characterizing low-temperature superinsulating phase, and the Berezinskii-Kosterlitz-Thouless criticality of the conductance above the superinsulator critical temperature, vanish upon increasing disorder taking the system far from the disorder-driven superconductor-insulator transition. We find that decrease in the system's effective size suppresses its insulating and superinsulating properties and that threshold voltage drops linearly with the diminishing system size. We demonstrate that this linear dependence can be used for experimental measurement of the linear tension of the electric string binding Cooper pairs and anti-Cooper pairs in a superinsulator.
- Subjects
SUPERCONDUCTING transitions; THRESHOLD voltage; CRITICAL temperature; COOPER pair; ELECTRIC admittance; NIOBIUM alloys; ELECTRIC potential
- Publication
JETP Letters, 2019, Vol 109, Issue 12, p795
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364019120014