Anomalous upper critical field in the quasicrystal superconductor Ta<sub>1.6</sub>Te

ORAL

Abstract

Recently, Tokumoto et al. have discovered that the quasicrstal Ta1.6Te superconducts below Tc ~ 1 K (arXiv:2307.10679). This transition temperature is much higher than Tc ~ 0.05 K in the first quasicrystal superconductor, Al-Zn-Mg quasicrystal (Kamiya et al., Nat. Commun. 9, 154 (2018)). This allows detailed investigations of superconducting properties in quasicrystals. In this study, we have performed resistivity and ac magnetic susceptibility measurements on Ta1.6Te and determined the upper critical field down to 0.04 K (T/Tc ~ 0.04). We show that the temperature dependence of the upper critical field is anomalous.

*This study was supported by the JST-CREST program (grant no. JPMJCR22O3; Japan), JSPS KAKENHI Grant Numbers JP19H05821, JP23K04355, JP22H04485, and JP22K03537), and Tokuyama Science Foundation. MANA is supported by World Premier International Research Center Initiative (WPI), MEXT, Japan.​

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Presenters

  • Taichi Terashima

    • Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science

Authors

  • Taichi Terashima

    • Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science

  • Yuki Tokumoto

    • Institute of Industrial Science, The University of Tokyo

  • Kotaro Hamano

    • Institute of Industrial Science, The University of Tokyo

  • Takako Konoike

    • Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science

  • Naoki Kikugawa

    • Center for Basic Research on Materials, National Institute for Materials Science
    • Max Planck Institute for Chemical Physics of Solids

  • Keiichi Edagawa

    • Institute of Industrial Science, The University of Tokyo