Quantum Superconductor-Metal Transitions in the Presence of Quenched Disorder

Nicholas A. Lewellyn, Ilana M. Percher, Jj Nelson, Javier Garcia-Barriocanal, Irina Volotsenko, Aviad Frydman, Thomas Vojta, Allen M. Goldman

Research output: Contribution to journalArticle

Abstract

InOx films that are less disordered than those exhibiting direct quantum superconductor-insulator transitions feature quantum superconductor-metal transitions tuned by magnetic field. Resistance data across this superconductor-metal transition obey activated scaling, with critical exponents suggesting that the transition is governed by an infinite-randomness critical point in the universality class of the random transverse-field Ising model in two dimensions. The transition is accompanied by quantum Griffiths effects. This unusual behavior is expected for systems with quenched disorder in the presence of ohmic dissipation. Disorder leads to the formation of large rare regions which are locally ordered superconducting puddles dispersed in a metallic matrix. Their dissipative dynamics causes the activated scaling, as predicted by a renormalization group theory.

Original languageEnglish (US)
Pages (from-to)183-190
Number of pages8
JournalJournal of Superconductivity and Novel Magnetism
Volume33
Issue number1
DOIs
StatePublished - Jan 1 2020

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Keywords

  • Quantum Griffiths effects
  • Quenched disorder
  • Superconductor-metal transitions

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