Method for improving critical current for continuously preparing YBCO (Yttrium Barium Copper Oxide) strip

Abstract

The invention relates to a method for improving a critical current for continuously preparing a YBCO (Yttrium Barium Copper Oxide) strip, which comprises the following steps of: (1) in a vacuum chamber of equipment for continuously preparing a YBCO superconducting layer, fixing a metal substrate on a guide belt; (2) using YBCO as a target material, wherein the target-substrate distance is in the range of 40 to 60mm; (3) regulating a laser optical path before vacuumizing; (4) when the vacuum degree in the vacuum chamber is superior to 3*10<-4>Pa, heating the metal substrate to the temperature of 750 to 770 DEG C and controlling the pure oxygen atmosphere into 20 to 30Pa; (5) depositing a first layer of YBCO thin film under the laser frequency of 10 to 20Hz and at the traveling speed of 0.1 to 0.4mm / s, then depositing a plurality of layers of YBCO thin films, and when depositing the next layer of YBCO thin film every time, respectively rising the temperature of the metal substrate in the process of depositing the previous layer of YBCO thin film by 10 to 20 DEG C and depositing the next layer of YBCO thin film under the laser frequency of 10 to 40 Hz and at the traveling speed of 0.1 to 0.2mm / s; and (6) carrying out in-situ annealing to prepare the YBCO superconducting layer. According to the invention, the layered deposition is adopted, the temperature is properly risen between the layers, the problem of variation of a cube texture of the YBCO layer along with the increase of the thickness is solved, and the superconducting performance is effectively improved.

Description

technical field

[0001] The invention relates to a continuous preparation method of a thin film, which belongs to the technical field of superconducting materials, in particular to YBa 2 Cu 3 o 7-x (YBCO) coated conductor superconducting layer preparation and pulsed laser deposition (PLD) technical field. Background technique

[0002] After 30 years of development, high-temperature superconducting materials are currently changing from the basic research stage to the applied research stage. The research on high-temperature superconducting materials has made major breakthroughs in many aspects such as single crystals, thin films, bulk materials, wires, and coated conductors. , and will gradually be applied in fields such as energy, industry, transportation, medical care, aerospace, national defense and scientific experiments, playing a unique and irreplaceable role.

[0003] The application of high-temperature superconductors in strong electricity requires superconducting ma...

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