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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
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WRAP-Chiral-singlet-superconductivity-weakly-correlated-metal-LaPt3P-2021.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (1500Kb) | Preview |
Official URL: http://dx.doi.org/10.1038/s41467-021-22807-8
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 | |||||||||
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| 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 | |||||||||
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| 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 | |||||||||
| Copyright Holders: | The Authors | |||||||||
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