Manipulating superconducting fluctuations by the Little-Parks-de Gennes effect in ultrasmall Al loops

Neal E. Staley, Ying Liu

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The destruction of superconducting phase coherence by quantum fluctuations and the control of these fluctuations are a problem of long-standing interest, with recent impetus provided by the relevance of these issues to the pursuit of high temperature superconductivity. Building on the work of Little and Parks, de Gennes predicted more than three decades ago that superconductivity could be destroyed near half-integer-flux quanta in ultrasmall loops, resulting in a destructive regime, and restored by adding a superconducting side branch, which does not affect the flux quantization condition. We report the experimental observation of this Little-Parks-de Gennes effect in Al loops prepared by advanced e-beam lithography. We show that the effect can be used to restore the lost phase coherence by employing side branches.

Original languageEnglish (US)
Pages (from-to)14819-14823
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume109
Issue number37
DOIs
StatePublished - Sep 11 2012

All Science Journal Classification (ASJC) codes

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