Low-field magnetoresistance in granular Pb films near the insulator-superconductor transition.

Negative magnetoresistance, negative electroresistance, and metallic behavior on the insulating side of the two-dimensional superconductor-insulator transition in granular Pb films

Quantum criticality at the superconductor-insulator transition revealed by specific heat measurements

The superconductor-insulator transition (SIT) is considered an excellent example of a quantum phase transition that is driven by quantum fluctuations at zero temperature. The quantum critical point is characterized by a diverging correlation length and a vanishing energy scale. Low-energy fluctuations near quantum criticality may be experimentally detected by specific heat, cp, measurements. He...

Magnetic-Field Induced Superconductor-Insulator Transition in the La2-xSrxCuO4 System.

The magnetoresistance of underdoped La22xSrxCuO films with x ­ 0.048 and 0.051 is studied in magnetic fields up to 8.5 T and at temperatures down to 30 mK. The results indicate that the magnetic-field induced superconductor-insulator (SI) transition is qualitatively different from the reentrant transition described for indium oxide and interpreted as leading to a “bosonic insulator” phase. The ...

Two-dimensional superconductor-insulator transition in bulk single-crystal YBa2Cu3O6.38.

The deleterious effects of disorder are amplified in lower dimensions, where long-range coherence is, at best, only marginally stable. A case in point is the destruction of superconductivity in ultrathin granular' and continuous metal films. The disorder is parametrized by the film sheet resistance and the data suggest a zero-temperature threshold for quenching global superconducting coherence ...

Investigating the superconductor-insulator transition in thin films using drag resistance: Theoretical analysis of a proposed experiment

The magnetically driven superconductor-insulator transition in amorphous thin films e.g., InO and Ta exhibits several mysterious phenomena, such as a putative metallic phase and a huge magnetoresistance peak. Unfortunately, several conflicting categories of theories, particularly quantum-vortex condensation, and normal region percolation, explain key observations equally well. We present a expe...