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Temperature- and magnetic-field dependent measurements of the resistance ofultrathin superconducting TiN films are presented. The analysis of thetemperature dependence of the zero field resistance indicates an underlyinginsulating behavior, when the contribution of Aslamasov-Larkin fluctuations istaken into account. This demonstrates the possibility of coexistence of thesuperconducting and insulating phases and of a direct transition from the oneto the other. The scaling behavior of magnetic field data is in accordance witha superconductor-insulator transition (SIT) driven by quantum phasefluctuations in two-dimensional superconductor. The temperature dependence ofthe isomagnetic resistance data on the high-field side of the SIT has beenanalyzed and the presence of an insulating phase was confirmed. A transitionfrom the insulating to a metallic phase is found at high magnetic fields, wherethe zero-temperature asymptotic value of the resistance being equal to h/e^2.Comment: 5 pages, 4 eps figures, RevTeX4, Published versio

Superconductivity on the localization threshold and magnetic-field-tuned superconductor-insulator transition in TiN films