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  Unconventional superconductivity in Y5Rh6Sn18 probed by muon spin relaxation

Bhattacharyya, A., Adroja, D., Kase, N., Hillier, A., Akimitsu, J., & Strydom, A. (2015). Unconventional superconductivity in Y5Rh6Sn18 probed by muon spin relaxation. Scientific Reports, 5: 12926, pp. 1-8. doi:10.1038/srep12926.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-4E22-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-25F7-F
Genre: Journal Article

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Bhattacharyya, Amitava1, Author
Adroja, Devashibhai1, Author
Kase, Naoki1, Author
Hillier, Adrian1, Author
Akimitsu, Jun1, Author
Strydom, Andre2, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: Conventional superconductors are robust diamagnets that expel magnetic fields through the Meissner effect. It would therefore be unexpected if a superconducting ground state would support spontaneous magnetics fields. Such broken time-reversal symmetry states have been suggested for the high-temperature superconductors, but their identification remains experimentally controversial. We present magnetization, heat capacity, zero field and transverse field muon spin relaxation experiments on the recently discovered caged type superconductor Y5Rh6Sn18 (T-C=3.0 K). The electronic heat capacity of Y5Rh6Sn18 shows a T-3 dependence below T-c indicating an anisotropic superconducting gap with a point node. This result is in sharp contrast to that observed in the isostructural Lu5Rh6Sn18 which is a strong coupling s-wave superconductor. The temperature dependence of the deduced superfluid in density Y5Rh6Sn18 is consistent with a BCS s-wave gap function, while the zero-field muon spin relaxation measurements strongly evidences unconventional superconductivity through a spontaneous appearance of an internal magnetic field below the superconducting transition temperature, signifying that the superconducting state is categorized by the broken time-reversal symmetry.

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Language(s): eng - English
 Dates: 2015-08-192015-08-19
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000359691400001
DOI: 10.1038/srep12926
 Degree: -

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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 5 Sequence Number: 12926 Start / End Page: 1 - 8 Identifier: Other: 2045-2322
CoNE: /journals/resource/2045-2322