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

Parker, J. S., Read, Daniel, Kumar, A. and Xiong, P. 2006. Superconducting quantum phase transitions tuned by magnetic impurity and magnetic field in ultrathin a-Pb films. Europhysics Letters 75 (6) , pp. 950-956. 10.1209/epl/i2006-10198-1

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Abstract

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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: EDP Sciences
ISSN: 0295-5075
Last Modified: 04 Jun 2017 01:59
URI: http://orca.cf.ac.uk/id/eprint/7217

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