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Uniaxial spin texture in a superconducting electron gas revealed by exchange interactions

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arxiv 2502.19599 v5 pith:TYNWQFOA submitted 2025-02-26 cond-mat.supr-con cond-mat.mes-hallcond-mat.mtrl-sci

Junyi Yang , Changjiang Liu , Xianjing Zhou , Hanyu Hou , Kaijun Yin , Jianguo Wen , John Pearson , Alexey Suslov
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Dafei Jin Jidong S. Jiang Ulrich Welp Jian-Min Zuo Michael R. Norman Anand Bhattacharya
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classification cond-mat.supr-concond-mat.mes-hallcond-mat.mtrl-sci
keywords ktao3euoxinteractionsmagneticspinsuperconductinguniaxialanisotropy
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Two-dimensional superconductors with spin-textured Fermi surfaces can be a platform for realizing unconventional pairing states and are of substantial interest in the context of quantum information science, and superconducting spintronics/orbitronics. We observed an unusual in-plane uniaxial anisotropy in the superconducting 2D electron gas (2DEG) formed at EuOx/KTaO3 (110) interfaces, where the EuOx is magnetic. This anisotropy is not evident in AlOx/KTaO3 (110) where the overlayer is non-magnetic. Our results are consistent with a highly anisotropic 'half-Rashba' spin-textured Fermi surface in 2DEGs formed at the KTaO3 (110) interface that is hidden from external magnetic fields due to a near cancellation between orbital and spin moments but revealed by exchange interactions of the electrons in the 2DEG with Eu moments near the EuOx/KTaO3 (110) interface. The interactions between the uniaxial spin texture and the magnetic overlayer offer new ways to explore the interplay between magnetism and 2D superconductivity.

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  1. Superconductivity from the Slater mode: Application to KTaO3 heterostructures

    cond-mat.supr-con 2026-01 accept novelty 6.0 of 10

    Calculations show Slater-mode phonon pairing explains the orientation dependence of superconductivity at KTaO3 interfaces, but the coupling is too weak to explain the observed Tc by itself.

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