Magnetic Field-Induced Novel Insulating Phase in 2D Superconductors

G Sambandamurthy and N. Peter Armitage

in Conductor-Insulator Quantum Phase Transitions

Published in print June 2012 | ISBN: 9780199592593
Published online September 2012 | e-ISBN: 9780191741050 | DOI:
Magnetic Field-Induced Novel Insulating Phase in 2D Superconductors

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DC and finite frequency transport measurements of thin films of amorphous indium oxide that were driven through the critical point of superconductor-insulator transition by the application of perpendicular magnetic field are presented. The observation of non-monotonic dependence of resistance on magnetic field in the insulating phase, novel transport characteristics near the resistance peak and finite superfluid stiffness in the insulating phase are all discussed from the point of view that suggests a possible relation between the conduction mechanisms in the superconducting and insulating phases. The results are summarized in the form of an experimental phase diagram for disordered superconductors in the disorder-magnetic field plane.

Keywords: superconductors; thin films; transport phenomena; collective excitations; quantum phase transitions; phase diagram; fluctuation phenomena; microwave interaction

Chapter.  8047 words.  Illustrated.

Subjects: Mathematical and Statistical Physics

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