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<p>The ferroelectric field effect offers a promising avenue for manipulating the electrical and magnetic properties of materials by modulating carrier concentration, making it a key area of research in functional materials. This study investigates the modulation of superconductivity in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> (YBCO) films using BiFeO<sub>3</sub> as a ferroelectric layer. We explore the dependence of ferroelectric modulation on the thickness of YBCO films, focusing on the superconducting transition temperature (T<sub>C</sub>). For 80&#xa0;nm thick YBCO films, a modest modulation of T<sub>C</sub> by approximately 0.4&#xa0;K was observed under an applied electric field of 500&#xa0;kV/cm. In contrast, for 10&#xa0;nm thick YBCO films, the modulation effect was significantly enhanced, with a T<sub>C</sub> shift exceeding 3&#xa0;K. This enhanced modulation is attributed to the reduced film thickness, which facilitates more effective carrier concentration modulation, and the improved insulation properties of BiFeO<sub>3</sub> due to the post-annealing process. Our findings demonstrate that thinner YBCO films are more susceptible to ferroelectric modulation, highlighting the potential for rewritable Josephson junctions and other advanced superconducting devices.</p>

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Ferroelectric polarization of BiFeO3 modulating the superconductivity of YBa2Cu3O7-δ

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Qianqian Yang,
  • Yongkang Qi,
  • Dexin Dong,
  • Ruijuan Nie,
  • Furen Wang

摘要

The ferroelectric field effect offers a promising avenue for manipulating the electrical and magnetic properties of materials by modulating carrier concentration, making it a key area of research in functional materials. This study investigates the modulation of superconductivity in YBa2Cu3O7-δ (YBCO) films using BiFeO3 as a ferroelectric layer. We explore the dependence of ferroelectric modulation on the thickness of YBCO films, focusing on the superconducting transition temperature (TC). For 80 nm thick YBCO films, a modest modulation of TC by approximately 0.4 K was observed under an applied electric field of 500 kV/cm. In contrast, for 10 nm thick YBCO films, the modulation effect was significantly enhanced, with a TC shift exceeding 3 K. This enhanced modulation is attributed to the reduced film thickness, which facilitates more effective carrier concentration modulation, and the improved insulation properties of BiFeO3 due to the post-annealing process. Our findings demonstrate that thinner YBCO films are more susceptible to ferroelectric modulation, highlighting the potential for rewritable Josephson junctions and other advanced superconducting devices.