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)
JournalJournal of Superconductivity and Novel Magnetism
DOIs
StateAccepted/In press - Jan 1 2019

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Superconducting materials
Transition metals
transition metals
disorders
inosine dialdehyde
ohmic dissipation
scaling
Group theory
Ising model
group theory
critical point
insulators
exponents
Magnetic fields
causes
matrices
magnetic fields

Keywords

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

Cite this

Quantum Superconductor-Metal Transitions in the Presence of Quenched Disorder. / Lewellyn, Nicholas A.; Percher, Ilana M.; Nelson, Jj; Garcia Barriocanal, Javier; Volotsenko, Irina; Frydman, Aviad; Vojta, Thomas; Goldman, Allen M.

In: Journal of Superconductivity and Novel Magnetism, 01.01.2019.

Research output: Contribution to journalArticle

Lewellyn, Nicholas A. ; Percher, Ilana M. ; Nelson, Jj ; Garcia Barriocanal, Javier ; Volotsenko, Irina ; Frydman, Aviad ; Vojta, Thomas ; Goldman, Allen M. / Quantum Superconductor-Metal Transitions in the Presence of Quenched Disorder. In: Journal of Superconductivity and Novel Magnetism. 2019.
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