Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session V41: Superconductor-Insulator Transitions
8:00 AM–11:00 AM,
Thursday, March 18, 2010
Sponsoring Unit: DCMP
Chair: Mike Osofsky, Naval Research Laboratory
Abstract ID: BAPS.2010.MAR.V41.4
Abstract: V41.00004 : Indirect Magnetic-Field-Tuned Superconductor-Insulator Transitions of Quasi-Two Dimensional Metal Films*
8:36 AM–8:48 AM
Preview Abstract Abstract
(University of Minnesota)
(University of MInnesota)
Homogeneous films of amorphous bismuth have been continuously tuned from the superconducting state by increasing a perpendicular magnetic field. Electrical transport and Hall measurements show that the non-superconducting states of the films are quantum-corrected metals. In the vicinity of transition field, the resistance can be scaled with critical exponent product $\nu $z=0.4 at high temperatures but this form fails at lower temperatures where the resistance is a non-monotonic function of temperature. This suggests that a two-phase regime develops near criticality and the transition becomes indirect from superconductor to insulator with this two-phase regime in between at nonzero temperature. We also compare the magnitoresistance of homogeneous and granular bismuth films.
*This work is supported in part by the National Science Foundation under grant NSF/DMR-0455121.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.V41.4
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