Volume 75, Number 6, September 2006
|Page(s)||950 - 956|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||09 August 2006|
Superconducting quantum phase transitions tuned by magnetic impurity and magnetic field in ultrathin - films
Department of Physics and Center for Materials Research and Technology Florida State University - Tallahassee, FL 32306, USA
Corresponding author: firstname.lastname@example.org
Accepted: 21 July 2006
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.
PACS: 74.78.-w – Superconducting films and low-dimensional structures / 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 73.50.-h – Electronic transport phenomena in thin films
© EDP Sciences, 2006
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