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A method to access the electro-mechanical properties of superconducting thin film under uniaxial compression

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Abstract

Superconducting thin films are widely used in superconducting quantum interferometers, microwave devices, etc. The electrical performance of a superconducting thin film is often affected by structural deformation or stress. Based on four-point bending of a Cu-Be beam, we constructed a device that could apply uniaxial, uniform, compressive strain to a superconducting thin film at both room temperature and the temperature of liquid nitrogen. The thin film was placed into a slot carved in the Cu-Be beam. We optimized the size of this slot via numerical simulation. Our results indicated that the slot width was optimal when it was same as the width of the Cu-Be beam. Notably, the sample bended hardly after machining two slits along width direction on both sides of the slot. A YBa2Cu3O7-δ-SrTiO3 (YBCO-STO) film was used as an example. It was loaded by the aforementioned device to determine its electrical characteristics as functions of the uniaxial-uniform-compressive strain. The optimized design allowed the sample to be compressed to a larger strain without breaking it.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grants 11622217, 11872196, and 11902130). This work is also supported by the Fundamental Research Funds for the Central Universities (Grant lzujbky-2018-9).

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Authors and Affiliations

  1. Department of Mechanics and Engineering Sciences, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, 730000, China

    Xiyang Su, Cong Liu, Jun Zhou, Xingyi Zhang & Youhe Zhou

  2. Key Laboratory of Mechanics on Disaster and Environment in Western China Attached to the Ministry of Education of China, Lanzhou University, Lanzhou, 730000, China

    Xiyang Su, Cong Liu, Jun Zhou, Xingyi Zhang & Youhe Zhou

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  1. Xiyang Su
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  2. Cong Liu
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  3. Jun Zhou
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Correspondence to Xingyi Zhang.

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Su, X., Liu, C., Zhou, J. et al. A method to access the electro-mechanical properties of superconducting thin film under uniaxial compression. Acta Mech. Sin. 36, 1046–1050 (2020). https://doi.org/10.1007/s10409-020-00986-9

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  • DOI: https://doi.org/10.1007/s10409-020-00986-9

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