Unusual superconducting isotope effect in the presence of a quantum criticality
Number of Authors: 3
2016 (English)In: Physical Review B, ISSN 2469-9950, Vol. 93, no 18, 184507Article in journal (Refereed) Published
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
2016. Vol. 93, no 18, 184507
IdentifiersURN: urn:nbn:se:su:diva-132067DOI: 10.1103/PhysRevB.93.184507ISI: 000376635900006OAI: oai:DiVA.org:su-132067DiVA: diva2:948242