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Münster 1997 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 1: Mesoskopische Systeme

TT 1.5: Vortrag

Montag, 17. März 1997, 11:00–11:15, F1

Quantum Fluctuations and Resistivity of Thin Superconducting Wires — •Andrei D. Zaikin1, Dmitrii S. Golubev2, Anne van Otterlo3, and Gergely T. Zimanyi31Institut für Theoretische Festkörperphysik, Universität Karlsruhe (TH), 76128 Karlsruhe. — 2I.E.Tamm Department of Theoretical Physics, P.N.Lebedev Physics Institute, Leninskii pr. 53, 117924 Moscow, Russia — 3Physics Department, University of California, Davis, CA 95616, USA

We present a microscopic study of the quantum fluctuations of the superconducting order parameter in thin homogeneous superconducting wires at all temperatures below TC. The rate of quantum phase slip processes determines the resistance R(T) of the wire, which is observable in very thin wires, even at low temperature. Furthermore, we predict a new low temperature metallic phase below a critical wire-thickness in the 10nm range, in which quantum phase slips proliferate.

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