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dc.contributor.authorChronister, Aaron
dc.contributor.authorPustogow, Andrej
dc.contributor.authorKikugawa, Naoki
dc.contributor.authorSokolov, Dmitry A.
dc.contributor.authorJerzembeck, Fabian
dc.contributor.authorHicks, Clifford W.
dc.contributor.authorMackenzie, A.P.
dc.contributor.authorBauer, Eric D.
dc.contributor.authorBrown, Stuart E.
dc.identifier.citationChronister , A , Pustogow , A , Kikugawa , N , Sokolov , D A , Jerzembeck , F , Hicks , C W , Mackenzie , A P , Bauer , E D & Brown , S E 2021 , ' Evidence for even parity unconventional superconductivity in Sr 2 RuO 4 ' , Proceedings of the National Academy of Sciences of the United States of America , vol. 118 , no. 25 , e2025313118 .
dc.identifier.otherRIS: urn:E4EC40D2A91ED31BD5BB784DF67D6F7B
dc.descriptionFunding: A.C. is grateful for support from the Julian Schwinger Foundation for Physics Research. A.P. acknowledges support by the Alexander von Humboldt Foundation through the Feodor Lynen Fellowship. Work at Los Alamos was funded by Laboratory Directed Research and Development (LDRD) program, and A.P. acknowledges partial support through the LDRD. N.K. acknowledges the support by the Grants-in-Aid for Scientific Research (KAKENHI, Grant JP18K04715 and JP21H01033) from Japan Society for the Promotion of Science (JSPS). The work at Dresden was funded by the Deutsche Forschungsgemeinschaft - TRR 288 - 422213477 (projects A10 and B01). The work at University of California, Los Angeles, was supported by NSF Grants 1709304 and 2004553.en
dc.description.abstractUnambiguous identification of the superconducting order parameter symmetry in Sr2RuO4 has remained elusive for more than a quarter century. While a chiral p-wave ground state analogue to superfluid 3He-A was ruled out only very recently, other proposed triplet-pairing scenarios are still viable. Establishing the condensate magnetic susceptibility reveals a sharp distinction between even-parity (singlet) and odd-parity (triplet) pairing since the superconducting condensate is magnetically polarizable only in the latter case. Here field-dependent 17O Knight shift measurements, being sensitive to the spin polarization, are compared to previously reported specific heat measurements for the purpose of distinguishing the condensate contribution from that due to quasiparticles. We conclude that the shift results can be accounted for entirely by the expected field-induced quasiparticle response. An upper bound for the condensate magnetic response of < 10% of the normal state susceptibility is sufficient to exclude all purely odd-parity candidates. 
dc.relation.ispartofProceedings of the National Academy of Sciences of the United States of Americaen
dc.subjectUnconventional superconductivityen
dc.subjectTriplet pairingen
dc.subjectNuclear magnetic resonanceen
dc.subjectKnight shiften
dc.subjectOrder parameteren
dc.subjectQC Physicsen
dc.subjectTK Electrical engineering. Electronics Nuclear engineeringen
dc.titleEvidence for even parity unconventional superconductivity in Sr2RuO4en
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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