Physics – Condensed Matter – Superconductivity
Scientific paper
2007-05-11
Physical Review Letters 99, 257003 (2007)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, published version
Scientific paper
10.1103/PhysRevLett.99.257003
We investigate low-temperature transport properties of thin TiN superconducting films in the vicinity of the disorder-driven superconductor-insulator transition. In a zero magnetic field, we find an extremely sharp separation between superconducting and insulating phases, evidencing a direct superconductor-insulator transition without an intermediate metallic phase. At moderate temperatures, in the insulating films we reveal thermally activated conductivity with the magnetic field-dependent activation energy. At very low temperatures, we observe a zero-conductivity state, which is destroyed at some depinning threshold voltage V_T. These findings indicate formation of a distinct collective state of the localized Cooper pairs in the critical region at both sides of the transition.
Baklanov M. R.
Baturina Tatyana. I.
Mironov Yu. A.
Strunk Ch
Vinokur Valeri M.
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