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Theoretical Analysis on Electromagnetic Properties of the Superconducting LaAlO3/SrTiO3 Interface

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Abstract

The origin of superconductivity and pairing symmetry of order parameter in the LaAlO\(_3\)/SrTiO\(_3\) interface are still elusive problems up to now. Based on the two-band Ginzburg-Landau theory, we study the electromagnetic properties of this oxide heterostructure with the Neumann boundary conditions. We calculate the temperature dependence of upper critical field in arbitrary direction and critical supercurrent density through the interface. We also compute the upper critical field and superfluid stiffness at different gate voltages. Our theoretical results are in good agreement with the experimental data, which strongly suggests the existence of two-gap s-wave superconductivity in this electron system.

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Authors and Affiliations

  1. School of Nuclear Science and Engineering, North China Electric Power University, Beijing, 102206, China

    Chen-Xiao Ye

  2. Department of Mathematics and Physics, North China Electric Power University, Beijing, 102206, China

    Jian-Tao Che, Tian-Yi Han & Hai Huang

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  1. Chen-Xiao Ye
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  2. Jian-Tao Che
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Correspondence to Hai Huang.

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Ye, CX., Che, JT., Han, TY. et al. Theoretical Analysis on Electromagnetic Properties of the Superconducting LaAlO3/SrTiO3 Interface. J Supercond Nov Magn 35, 3497–3504 (2022). https://doi.org/10.1007/s10948-022-06390-7

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  • DOI: https://doi.org/10.1007/s10948-022-06390-7

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