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

作　　者：Xiyang Su Cong Liu Jun Zhou Xingyi Zhang Youhe Zhou 

机构地区：[1]Department of Mechanics and Engineering Sciences,College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China [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

出　　处：《Acta Mechanica Sinica》2020年第5期1046-1050,I0002,共6页力学学报（英文版）

基　　金：the National Natural Science Foundation of China(Grants 11622217,11872196,and11902130);the Fundamental ResearchFunds for the Central Universities(Grant lzujbky-2018-9).

摘　　要：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-δSrTiO3(YBCO-STO)film was used as an example.It was loadedby 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.

关 键 词：YBa2Cu3O7-δthin film Compressive strain Critical current density 

分 类 号：O346.1[理学—固体力学]