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Evidence for even parity unconventional superconductivity in Sr2RuO4

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Chronister_Pustogow_revised_noblue.pdf (567.2Kb)
Date
22/06/2021
Author
Chronister, Aaron
Pustogow, Andrej
Kikugawa, Naoki
Sokolov, Dmitry A.
Jerzembeck, Fabian
Hicks, Clifford W.
Mackenzie, A.P.
Bauer, Eric D.
Brown, Stuart E.
Keywords
Unconventional superconductivity
Triplet pairing
Sr2RuO4
Nuclear magnetic resonance
Knight shift
Order parameter
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
DAS
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Abstract
Unambiguous 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. 
Citation
Chronister , 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 . https://doi.org/10.1073/pnas.2025313118
Publication
Proceedings of the National Academy of Sciences of the United States of America
Status
Peer reviewed
DOI
https://doi.org/10.1073/pnas.2025313118
ISSN
0027-8424
Type
Journal article
Rights
Copyright © 2021 the Author(s). This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1073/pnas.2025313118.
Description
Funding: 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.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/24559

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