Wednesday, April 29, 2009, 11:00 am — Small Seminar Room, Bldg. 510
Transport studies of the disorder driven superconductor-insulator transition (SIT) suggest that the system may be inherently inhomogeneous. The insulating phase, for example, is composed of superconducting regions embedded in an Anderson-insulating matrix, and a complementary situation may exist on the superconducting side of the SIT. Recent microstructure analysis, employing electron-loss spectroscopy on amorphous indium-oxide films supports this scenario, which gives rise to a variety of transport peculiarities. The co-existence of superconducting and insulating regions implies the relevance of Andreev processes through localized states. Experiments to elucidate these processes will be shown and discussed.
Disorder induced Granularity in an amorphous Superconductor, D. Kowal and Z. Ovadyahu, Solid State Comm., 90, 783 (1994).
Microwaves-induced oscillations in Andreev tunneling, A Vaknin and Z. Ovadyahu Europhys. Letters, 47, 615 (1999).
Excess conductance in normal-metal/superconductor junctions, A Vaknin, A. Frydman, and Z. Ovadyahu, Phys. Rev. B 61, 13037 (2000).
Scale dependent superconductor-insulator transition, D. Kowal and Z. Ovadyahu, Physica C 468, 322 (2008).
Hosted by: Myron Strongin
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