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. Zimanyi³ — ¹Institut 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 T_C. 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.