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  Evidence for even parity unconventional superconductivity in Sr2RuO4

Chronister, A., Pustogow, A., Kikugawa, N., Sokolov, D. A., Jerzembeck, F., Hicks, C. W., et al. (2021). Evidence for even parity unconventional superconductivity in Sr2RuO4. Proceedings of the National Academy of Sciences of the United States of America, 118(25): e2025313118, pp. 1-5. doi:10.1073/pnas.2025313118.

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 Creators:
Chronister, Aaron1, Author
Pustogow, Andrej1, Author
Kikugawa, Naoki1, Author
Sokolov, Dmitry A.2, Author           
Jerzembeck, Fabian2, Author           
Hicks, Clifford W.3, Author           
Mackenzie, Andrew P.4, Author           
Bauer, Eric D.1, Author
Brown, Stuart E.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Clifford Hicks, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863466              
4Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              

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Free keywords: Unconventional superconductivity | triplet pairing | Knight shift | nuclear magnetic resonance | order parameter, article, heat, nuclear magnetic resonance, parity, polarization, superconductivity
 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. © 2021 National Academy of Sciences. All rights reserved.

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Language(s): eng - English
 Dates: 2021-06-142021-06-14
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1073/pnas.2025313118
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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : PNAS
  Other : Proceedings of the National Academy of Sciences of the USA
  Abbreviation : Proc. Natl. Acad. Sci. U. S. A.
Source Genre: Journal
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Publ. Info: Washington, D.C. : National Academy of Sciences
Pages: - Volume / Issue: 118 (25) Sequence Number: e2025313118 Start / End Page: 1 - 5 Identifier: ISSN: 0027-8424
CoNE: https://pure.mpg.de/cone/journals/resource/954925427230