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Unusual superconducting isotope effect in the presence of a quantum criticality
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 93, no 18, 184507Article in journal (Refereed) PublishedText
Abstract [en]

The isotope effect in superconductivity (SC) is used to make a concrete connection to a quantum critical point (QCP) that is tunable by isotopic mass substitution. We find a distinct contribution to the isotope exponent in SC and derive an explicit relation to the critical exponent of a QCP. The relation between the two exponents is general and can be used as an experimental signature for the connection between SC and a QCP. We demonstrate it in a scenario where the SC pairing is due to modes related to a structural instability. Within this model the isotope exponent is derived in terms of microscopic parameters.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 93, no 18, 184507
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-188730DOI: 10.1103/PhysRevB.93.184507ISI: 000376635900006ScopusID: 2-s2.0-84970951890OAI: oai:DiVA.org:kth-188730DiVA: diva2:939695
Note

QC 20160620

Available from: 2016-06-20 Created: 2016-06-17 Last updated: 2016-06-20Bibliographically approved

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Kedem, YaronBalatsky, Alexander V.
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