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Preparation and properties of YBCO/Bi-2212/YBCO superconducting trilayer films by acetate based sol–gel method

  • Original Paper: Industrial and technological applications of sol–gel and hybrid materials
  • Published:
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Abstract

YBa2Cu3O7−δ(YBCO)/Bi2Sr2CaCu2O8+δ(Bi-2212)/YBCO trilayer films with c-axis epitaxial orientation have been successfully prepared on LaAlO3 (LAO) monocrystalline substrates by sol–gel method using metallic acetates as starting materials. The effect of heat treatment temperature of upper YBCO films on the structure and superconductivity of YBCO/Bi-2212/YBCO planar-type junction have been studied. When the upper YBCO film fabricated at 750 °C, YBCO/Bi-2212/YBCO trilayer films exhibited good in-plane and out-of-plane growth texture and good superconductivity. Two superconducting transition steps in the R–T curves of YBCO/Bi-2212/YBCO trilayer films were clearly observed. Current–voltage (I–V) curves at 50–65 K of trilayer structure exhibit a supercurrent with zero voltage, and the superconducting critical current Ic is proportion to (1 − T⁄Tc)3.5. We suggest that a weak-link contact, which appears to have an SNSNS type structure, formed at the interface of YBCO/Bi-2212/YBCO trilayer structure.

YBCO)/Bi-2212/YBCO trilayer films with good c-axis epitaxial orientation and superconductivity have been successfully prepared on by photosensitive sol–gel method. Current–voltage (I–V) curves at 50–65 K of trilayer structure exhibit a supercurrent with zero voltage, and the superconducting critical current Ic is proportion to (1−T⁄Tc)3.5. The results indicating that a weak-link contact, which appears to have an SNSNS type structure, formed at the interface of YBCO/Bi-2212/YBCO trilayer structure.

Highlights

  • An innovative approach to preparation of YBCO/Bi-2212/YBCO superconducting heteroepitaxial structure is proposed.

  • Two superconducting transition steps in the R–T curves of YBCO/Bi-2212/YBCO trilayer films were clearly observed.

  • Current–voltage (I–V) curves at 50–65 K of trilayer structure exhibit a supercurrent with zero voltage, and the changing relationship between and Tc of Bi-2212/YBCO heteroepitaxial structure is Ic ∝ (1−T/Tc)3.5.

  • A weak-link junction, which is similar to SNSNS junctions, formed at the interface of YBCO/Bi-2212/YBCO trilayer structure.

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  1. Shaanxi Engineering Research Center of Controllable Neutron Source, School of Science, Xijing University, Xi’an, 710123, PR China

    Xiaoqin Liu

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Liu, X. Preparation and properties of YBCO/Bi-2212/YBCO superconducting trilayer films by acetate based sol–gel method. J Sol-Gel Sci Technol 98, 68–75 (2021). https://doi.org/10.1007/s10971-021-05481-6

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  • DOI: https://doi.org/10.1007/s10971-021-05481-6

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