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Superconductivity in quasicrystals poses a new challenge in condensed matter physics. We measuredtheresistanceandacmagneticsusceptibilityofaTa1.6Tedodecagonalquasicrystal, which is superconducting below Tc ∼ 1 K. We show that the upper critical field increases linearlywithalargeslopeof−4.4T/Kwithdecreasingtemperaturedownto0.04K,withno tendencytoleveloff.Theextrapolatedzero-temperaturecriticalfieldexceedsthePaulilimit by a factor of 2.3. We also observed flux-flow resistance with thermally activated behavior and an irreversibility field that is distinct from the upper critical field. We discuss these peculiarities in terms of the nonuniform superconducting gap and spin–orbit interaction in quasicrystal structures.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: superconductivity, quasicrystal, upper critical field

Date published: 2024-07-20

Publisher: Springer Science and Business Media LLC

Journal:

• npj Quantum Materials (ISSN: 23974648) vol. 9 issue. 1 56

Funding:

• MEXT | Japan Society for the Promotion of Science JP22H04485
• MEXT | Japan Society for the Promotion of Science JP22K03537
• MEXT | Japan Society for the Promotion of Science JP23K04355
• Tokuyama Science Foundation
• MEXT | JST | Core Research for Evolutional Science and Technology JPMJCR22O3
• MEXT | Japan Society for the Promotion of Science JP19H05821

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41535-024-00669-9

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Updated at: 2024-07-22 12:30:30 +0900

Published on MDR: 2024-07-22 12:30:30 +0900