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  Strong increase in ultrasound attenuation below Tc in Sr2 RuO4: Possible evidence for domains

Ghosh, S., Kiely, T. G., Shekhter, A., Jerzembeck, F., Kikugawa, N., Sokolov, D. A., et al. (2022). Strong increase in ultrasound attenuation below Tc in Sr2 RuO4: Possible evidence for domains. Physical Review B, (2): 024520, pp. 1-8. doi:10.1103/PhysRevB.106.024520.

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 Creators:
Ghosh, Sayak1, Author
Kiely, Thomas G.1, Author
Shekhter, Arkady1, Author
Jerzembeck, F.2, Author           
Kikugawa, N.1, Author
Sokolov, Dmitry A.2, Author           
Mackenzie, A. P.3, Author           
Ramshaw, B. J.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863463              

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Free keywords: Bismuth compounds, Degrees of freedom (mechanics), Domain walls, Strontium compounds, Ultrasonic waves, Collective modes, Lower energies, Multiple degrees of freedom, Order parameter, Sound attenuation, Superconducting order parameters, Superconducting state, Time reversal symmetries, Two-component, Ultrasound attenuation, Shear waves
 Abstract: Recent experiments suggest that Sr2RuO4 has a two-component superconducting order parameter (OP). A two-component OP has multiple degrees of freedom in the superconducting state that can result in low-energy collective modes or the formation of domain walls-a possibility that would explain a number of experimental observations including the smallness of the signature of time reversal symmetry breaking at Tc and telegraph noise in critical current experiments. We use resonant ultrasound spectroscopy to perform ultrasound attenuation measurements across the superconducting Tc of Sr2RuO4. We find that compressional sound attenuation increases by a factor of 7 immediately below Tc, in sharp contrast with what is found in both conventional (s-wave) and high-Tc (d-wave) superconductors. Our observations are most consistent with the presence of domain walls that separate different configurations of the superconducting OP. The fact that we only observe an increase in sound attenuation for compressional strains, and not for shear strains, suggests an inhomogeneous superconducting state formed of two distinct, accidentally degenerate superconducting OPs that are not related to each other by symmetry. Whatever the mechanism, a factor of 7 increase in sound attenuation is a singular characteristic that must be reconciled with any potential theory of superconductivity in Sr2RuO4. © 2022 American Physical Society.

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Language(s): eng - English
 Dates: 2022-07-272022-07-27
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.106.024520
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: (2) Sequence Number: 024520 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008