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arXiv · 2212.00925

Superconductivity in a Magnetic Rashba Semimetal EuAuBi

Hidefumi Takahashi·Kazuto Akiba·Masayuki Takahashi·Alex H. Mayo·Masayuki Ochi·Tatsuo C. Kobayashi·Shintaro Ishiwata
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Abstract

We report the observation of superconductivity with multiple magnetic ordering and Rashba-type spin-orbit coupling in a layered polar semimetal EuAuBi. Magnetic transition is observed at 4 K, followed by a superconducting transition at 2.2 K, which is sensitive to the crystal surface conditions. The upper critical field Hc2 of 9.8 T for the out-of-plane field is three times higher than that for the in-plane field, which can be associated with the two-dimensional structure or the surface state. On the basis of first-principles calculations, it is found that the characteristic Hc2 possibly reflects the anisotropic modification of the Fermi surface by the effective combination of Rashba-type spin splitting and Zeeman spin splitting enhanced by Eu moments.

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Hidefumi Takahashi, Kazuto Akiba, Masayuki Takahashi, Alex H. Mayo, Masayuki Ochi, Tatsuo C. Kobayashi, Shintaro Ishiwata. 2022-12-02. Superconductivity in a Magnetic Rashba Semimetal EuAuBi. https://doi.org/10.7566/jpsj.92.013701

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