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Chiral singlet superconductivity in the weakly correlated metal LaPt3P

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Biswas, P. K., Ghosh, S. K., Zhao, J. Z., Mayoh, Daniel, Zhigadlo, N. D., Xu, Xiaofeng, Baines, C., Hillier, A. D., Balakrishnan, Geetha and Lees, Martin R. (2021) Chiral singlet superconductivity in the weakly correlated metal LaPt3P. Nature Communications, 12 (1). 2504. doi:10.1038/s41467-021-22807-8 ISSN 2041-1723.

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Official URL: http://dx.doi.org/10.1038/s41467-021-22807-8

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Abstract

Chiral superconductors are novel topological materials with finite angular momentum Cooper pairs circulating around a unique chiral axis, thereby spontaneously breaking time-reversal symmetry. They are rather scarce and usually feature triplet pairing: a canonical example is the chiral p-wave state realized in the A-phase of superfluid He3. Chiral triplet superconductors are, however, topologically fragile with the corresponding gapless boundary modes only weakly protected against symmetry-preserving perturbations in contrast to their singlet counterparts. Using muon spin relaxation measurements, here we report that the weakly correlated pnictide compound LaPt3P has the two key features of a chiral superconductor: spontaneous magnetic fields inside the superconducting state indicating broken time-reversal symmetry and low temperature linear behaviour in the superfluid density indicating line nodes in the order parameter. Using symmetry analysis, first principles band structure calculation and mean-field theory, we unambiguously establish that the superconducting ground state of LaPt3P is a chiral d-wave singlet.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Superconductors , Superconductors -- Magnetic properties, Muon spin rotation
Journal or Publication Title: Nature Communications
Publisher: Springer Nature Ltd
ISSN: 2041-1723
Official Date: 4 May 2021
Dates:
DateEvent
4 May 2021Published
30 March 2021Accepted
10 December 2020Submitted
Volume: 12
Number: 1
Article Number: 2504
DOI: 10.1038/s41467-021-22807-8
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Copyright Holders: The Authors
Date of first compliant deposit: 17 May 2021
Date of first compliant Open Access: 17 May 2021
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/T005963/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
11974061[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
Is Part Of: 1
Open Access Version:
  • https://doi.org/10.1038/s41467-021-22807...

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