Superconductor-insulator transition in quasi-one-dimensional nanowires
Bollinger, Anthony Travis
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https://hdl.handle.net/2142/32092
Description
Title
Superconductor-insulator transition in quasi-one-dimensional nanowires
Author(s)
Bollinger, Anthony Travis
Issue Date
2005-10
Director of Research (if dissertation) or Advisor (if thesis)
Bezryadin, Alexey
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Molybdenum Germanium (MoGe)
superconducting nanowires
superconductor insulator transition
superconductivity
Langer, Ambegaokar, McCumber and Halperin (LAMH) theory
Language
en
Abstract
We have studied a large group of superconducting MoGe nanowires fabricated by a molecular templating technique. A well-defined superconductor-insulator transition (SIT) is observed in homogeneous wires with lengths less than ~200 nm. The total normal state resistance of the wire is found to be the control parameter for this transition with the critical point occurring near the quantum of resistance for Cooper pairs. Wires in the superconducting phase of the SIT are well described by the Langer-Ambegaokar-McCumber-Halperin theory of thermally activated phase slips. No resistance “tails” characteristic of quantum phase slips were observed. Wires in the insulating phase of the SIT follow the predictions of the theory of weak Coulomb blockade in a diffusive normal metal. Longer wires display signs of a “mixed” behavior that is similar to that found for inhomogeneous wires in which a single wire acts as a combination of two or more superconducting and/or insulating sections.
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