A preparation method of bi2sr2cacu2o8 single Josephson surface junction
A single, single crystal technology, applied in the manufacture/processing of superconductor devices, electrical components, superconductive devices, etc., can solve the problems of inability to obtain a single junction, surface junction interference, etc., and achieve the effect of high success rate and easy operation.
Active Publication Date: 2019-04-12
NANJING UNIV
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Problems solved by technology
[0003] A large number of research results have enabled people to have a more comprehensive understanding of the characteristics of the internal junction. However, due to the limitations of the manufacturing process, the current method of preparing the surface junction will inevitably produce an internal junction. In the process of testing the surface area, The characteristics of the surface junction are easily disturbed by the internal junction, and the current-voltage characteristics of the surface junction are usually obtained by limiting the bias current ( IV ) curve, it is not yet possible to obtain the overall IV curve
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Embodiment 1
[0032] A Bi 2 Sr 2 CaCu 2 o 8 A method for preparing a single Josephson surface junction, the steps are as follows:
[0033] 1) Select a BSCCO single crystal 3 with a flat surface, and fix it on the MgO substrate 1 with polyimide insulating glue 2 . Lay the flat surface of the single crystal to the MgO substrate, place the pasted sample on a baking table, bake at 60°C for 1 hour, at 80°C for 1 hour, and at 120°C for 1.5 hours, so that the glue is completely cured.
[0034] 2) After the sample is completely fixed on the MgO substrate, a layer of gold film 4 is evaporated on the surface of the single crystal as an electrode by in-situ thermal evaporation. The so-called in-situ thermal evaporation means that the sample is first placed in a thermal evaporation environment , when the evaporation rate of gold reaches 1.8nm / s, the sample is quickly cleaved and evaporated gold.
[0035] 3) According to the size of the expected junction area and the structure of the coupling anten...
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Abstract
The invention discloses a Bi 2 Sr 2 CaCu 2 o 8 The preparation method of a single Josephson surface junction, the BSCCO single crystal is placed in a vacuum environment of thermal evaporation for cleavage, and the gold electrode is quickly thermally evaporated after cleavage, and the pattern is directly photolithographically etched by argon ion beam etching. The gold film and BSCCO single crystal outside the pattern area, and then a layer of insulating SiO is evaporated around the pattern as a protection, and the upper and lower electrode patterns are obtained through gold evaporation and photolithography, and the gold film in other areas is etched with potassium iodide etching solution to prepare A Josephson surface knot with only one knot is produced. The preparation method is simple, overcomes the shortcomings of traditional ion beam etching that cannot accurately control the etching thickness and thus cannot prepare a single surface junction, greatly shortens the sample preparation cycle and improves the success rate of sample preparation, and can prepare only one junction. Josephson's surface junction, whose properties are not disturbed by internal junctions, has played a major role in promoting the research on the properties of surface junctions.
Description
technical field [0001] The invention relates to the technical field of BSCCO superconductor preparation, in particular to a Bi 2 Sr 2 CaCu 2 o 8 Fabrication method of a single Josephson surface junction. Background technique [0002] HTS Bi 2 Sr 2 CaCu 2 o 8+δ The (Bi-2212) intrinsic Josephson junction has a natural layered (superconducting layer S-insulating layer I-superconducting layer S) structure, which has been widely used in device applications and tunneling spectroscopy of high-temperature superconducting materials in recent years fields of study. In most studies, the method of argon ion etching is mainly used to fabricate the intrinsic Josephson junction array of the platform structure. Unlike the superconducting properties of the inner superconducting layer, the properties of the first junction at the surface tend to be different from the inner junction. [0003] A large number of research results have enabled people to have a more comprehensive understan...
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IPC IPC(8): H01L39/24H10N60/01
CPCH10N60/0744H10N60/0912
Inventor 蒋美萍周宪靖吴培亨
Owner NANJING UNIV