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Abstract <p>Electron transport studies of superconducting hybrid Josephson mesa-structures with antiferromagnetic barriers attract huge interest for their specific magnetic field dependences of superconducting current and possibility of spin-triplet pairing. We will exploit two antiferromagnetic materials: Ca<sub>1–<i>x</i></sub>Sr<sub><i>x</i></sub>CuO<sub>2</sub> and Sr<sub>2</sub>IrO<sub>4</sub>. The first one is A-type canted antiferromagnet, while the second one exhibits strong spin-orbit coupling that favorers spin-triplet pairing. In this study characteristics of superconducting transport in Josephson junctions YBaCuO/Sr<sub>2</sub>IrO<sub>4</sub>/Au-Nb are obtained. Barrier heights of 20 meV and localization radii α of 1.5 nm for Sr<sub>2</sub>IrO<sub>4</sub> were estimated. The radii were smaller than the α values for Ca<sub>0.5</sub>Sr<sub>0.5</sub>CuO<sub>2</sub> that is of 4–10 nm. The features of superconducting transport: DC Josephson effect with similar critical current and normal resistance products in order of <i>I</i><sub><i>C</i></sub><i>R</i><sub><i>N</i></sub> 50 µV, AC Josephson effect with presence of second harmonic of current-phase relation, are common for mesa-structures with the two kinds of barriers.</p>

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Oxide Antiferromagnetics as Barrier Materials for Josephson Junctions Based on Cuprate Superconductor

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • K. Y. Constantinian,
  • Yu. V. Kislinskii,
  • G. A. Ovsyannikov,
  • A. M. Petrzhik,
  • I. E. Moskal,
  • A. V. Shadrin

摘要

Abstract

Electron transport studies of superconducting hybrid Josephson mesa-structures with antiferromagnetic barriers attract huge interest for their specific magnetic field dependences of superconducting current and possibility of spin-triplet pairing. We will exploit two antiferromagnetic materials: Ca1–xSrxCuO2 and Sr2IrO4. The first one is A-type canted antiferromagnet, while the second one exhibits strong spin-orbit coupling that favorers spin-triplet pairing. In this study characteristics of superconducting transport in Josephson junctions YBaCuO/Sr2IrO4/Au-Nb are obtained. Barrier heights of 20 meV and localization radii α of 1.5 nm for Sr2IrO4 were estimated. The radii were smaller than the α values for Ca0.5Sr0.5CuO2 that is of 4–10 nm. The features of superconducting transport: DC Josephson effect with similar critical current and normal resistance products in order of ICRN 50 µV, AC Josephson effect with presence of second harmonic of current-phase relation, are common for mesa-structures with the two kinds of barriers.