Microstructure study of YBa2Cu3O7-δ thin film with synchrotron-based three-dimensional reciprocal space mapping

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Abstract

High-temperature superconducting films can be used for fabricating the cutting-edge high-temperature superconducting microwave devices because of their low microwave surface resistances. However, the microwave surface resistances of high-temperature superconducting materials are particularly sensitive to microstructure due to their special two-dimensional superconducting mechanisms and extremely short superconducting coherence lengths. To investigate the correlations between microstructure and microwave surface resistance of high-temperature superconducting materials, YBa ₂Cu ₃O _7-δ(YBCO) films with different thickness are grown on (00l)-oriented MgO single-crystal substrates by using the pulsed laser deposition (PLD) technique. Electrical measurements reveal that their superconducting transition temperatures and room temperature resistances do not show significant difference. However, their microwave surface resistances in superconducting state display a significant difference. The characterizations of the microstructures of YBCO films by synchrotron radiation three-dimensional reciprocal space mapping(3D-RSM) technique show that the number of the grains with CuO ₂face parallel to the surface (c crystals), and the consistency of grain orientation are the main causes for the difference in microwave surface resistance.

Keywords:

three-dimensional reciprocal space mapping/
YBCO films/
microstructures

Authors and contacts

Corresponding author:Gao Chen,gaochen@ucas.edu.cn

Funds:Project supported by the National Key Research and Development Program of China(Grant No. 2022YFA1603900), the Fundamental Research Funds for the Central Universities (Grant No. E1E40207X2) and UCAS (Grant Nos. E1EG0210X2, 118900M018)

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Cited By

DownLoad: Full-Size Img PowerPoint

	衍射峰实测三维积分强度
	(108)(018)	(109)(019)(130)
卡片上的相对强度	13 5	6 4 5
YBCO 400 nm	$ 9.136\times {10}^{6} $	$ 5.974\times {10}^{6} $
YBCO 1000 nm	$ 11.503\times {10}^{6} $	$ 7.769\times {10}^{6} $

DownLoad: CSV

样品厚度	衍射峰三维积分强度		c晶/b晶比
样品厚度	(109), (019)	(130)	c晶/b晶比
YBCO 400 nm	$ 1.015\times {10}^{6} $	$ 0.180\times {10}^{6} $	5.639∶1
YBCO 1000 nm	$ 1.278\times {10}^{6} $	$ 0.276\times {10}^{6} $	4.630∶1

DownLoad: CSV

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Vol. 72, Issue 4 - 2023-02-20

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