A spin–orbit scattering–enhanced high upper critical field at the LaAlO3/KTaO3(111) superconducting interface
A spin–orbit scattering–enhanced high upper critical field at the LaAlO3/KTaO3(111) superconducting interface
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DOI：
10.1088/1367-2630/acbae4
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Jiacai Nie
中科院分区：
文献类型：
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作者：
Zitao Zhang;Weimin Jiang;Tingna Shao;Yujie Qiao;Xingyu Chen;Qiang Zhao;Meihui Chen;Ruifen Dou;Chang-Min Xiong;Jiacai Nie
Abstract. Spin–orbit interaction is essential to enhance the in-plane upper critical field of two-dimensional superconductors. Here, we report the LaAlO3/KTaO3(111) superconducting interface (Tc,0 ≈ 0.475 K) with a high in-plane upper critical field (~1.6 T), which is approximately 1.8 times the Pauli paramagnetic limit. The H-T superconducting phase diagram is well-fitted by the Klemm–Luther–Beasley theory, and the relevant spin–orbit scattering length is approximately 32 nm. Furthermore, normal-state magnetotransport measurements show signatures of weak antilocalization caused by strong spin–orbit coupling in LaAlO3/KTaO3 (111). The spin diffusion length derived from magnetotransport measurements was 40 nm at 2 K, which is comparable with the spin–orbit scattering length. The conformity of the phase diagram with the Klemm–Luther–Beasley theory and the consistency of normal state spin diffusion length and superconducting spin–orbit scattering length indicate that the high in-plane upper critical field at the LaAlO3/KTaO3 (111) superconducting interface is enhanced by spin–orbit scattering.
