Method for preparing thallium-based high-temperature superconducting thin film without roasting target

Abstract

The invention discloses a method for preparing a thallium-based high-temperature superconducting thin film without a roasting target. The method comprises the steps that a Tl-Ba-Ca-Cu-O amorphous precursor thin film is deposited on a substrate chip; in the flowing oxygen atmosphere, the amorphous precursor thin film is placed in a closed synthetic sapphire crucible to be subjected to high-temperature heat treatment, and the Tl-Ba-Ca-Cu-O amorphous precursor thin film is converted into the Tl2Ba2CaCu2O8(Tl-2212) high-temperature superconducting thin film. The sapphire crucible with the smooth surface is adopted, attaching is tighter, the closing performance is enhanced, and components needed for crystallization can be provided through the thallium element content in the amorphous precursor thin film. Accordingly, the thallium-source containing roasting target is not needed, uncertain factors are reduced, and the quality of the manufactured superconducting thin film is stable. The Tl-2212 superconducting thin film manufactured through the method can be used for manufacturing microwave passive devices and can also be used for manufacturing other superconducting devices, conducting the scientific study and the like.

Description

technical field

[0001] The invention belongs to the technical field of superconducting electronic devices, and in particular relates to a method for making a thallium superconducting thin film. Especially when it comes to Tl 2 Ba 2 CaCu 2 o 8 (Tl-2212) Method for preparing thin films of high-temperature superconducting materials. Background technique

[0002] High-quality high-temperature superconducting thin films are of great significance in the application of superconducting electronic devices, especially microwave passive devices. The existing Tl-2212 superconducting thin film is prepared in two steps. For example, in Patent of Invention Publication No. 1516297, a method for preparing a thallium-based superconducting thin film is disclosed. It prepares superconducting thin films through two steps:

[0003] 1) Depositing a Tl-Ba-Ca-Cu-O amorphous precursor film on the substrate;

[0004] 2) In argon, or oxygen, or argon-oxygen mixed gas atmosphere (~10 5 Pa), per...

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