Superconductivity on the Localization Threshold and Magnetic-Field-Tuned Superconductor–Insulator Transition in TiN Films

Baturina, T. I.; Islamov, D. R.; Bentner, J.; Strunk, C.; Baklanov, M. R.; Satta, A.
April 2004
JETP Letters;4/10/2004, Vol. 79 Issue 7, p337
Academic Journal
Temperature- and magnetic-field-dependent measurements of the resistance of ultrathin superconducting TiN films are presented. The analysis of the temperature dependence of the zero-field resistance indicates an underlying insulating behavior, when the contribution of Aslamazov­Larkin fluctuations is taken into account. This demonstrates the possibility of the coexistence of the superconducting and insulating phases and of a direct transition from the one to the other. The scaling behavior of magnetic field data is in accordance with a super-conductor­insulator transition (SIT) driven by quantum phase fluctuations in two-dimensional superconductor. The temperature dependence of the isomagnetic resistance data on the high-field side of the SIT has been analyzed, and the presence of an insulating phase is confirmed. A transition from the insulating to a metallic phase is found at high magnetic fields, where the zero-temperature asymptotic value of the resistance is equal to h/e2.


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