Superconducting quantum phase transitions tuned by magnetic impurity and magnetic field in ultrathin a-Pb films

Details Superconducting quantum phase transitions tuned by magnetic impurity and magnetic field in ultrathin a-Pb films Superconducting quantum phase transitions tuned by magnetic impurity and magnetic field in ultrathin a-Pb films

2006-07-05

arxiv.org/abs/cond-mat/0607133v1

Physics

Condensed Matter

Superconductivity

17 pages, 4 figures

Scientific paper

10.1209/epl/i2006-10198-1

Superconducting quantum phase transitions tuned by disorder (d), paramagnetic impurity (MI) and perpendicular magnetic field (B) have been studied in homogeneously disordered ultrathin a-Pb films. The MI-tuned transition is characterized by progressive suppression of the critical temperature to zero and a continuous transition to a weakly insulating normal state with increasing MI density. In all important aspects, the d-tuned transition closely resembles the MI-tuned transition and both appear to be fermionic in nature. The B-tuned transition is qualitatively different and probably bosonic. In the critical region it exhibits transport behavior that suggests a B-induced mesoscale phase separation and presence of Cooper pairing in the insulating state.

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