Studies of the Superconductive Properties of YBCO Thin Films

• Main Authors: Chen Chih.Chang, 陳誌昌
• Other Authors: T.S.Lai
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/88709685366301527811

碩士 === 中原大學 === 應用物理研究所 === 86 === The step-edge type substrates of MgO were first prepared by the use of photolithography and ion etching technique.The YBCO superconducting thin films were then deposited on the step-edge MgO substrates by the in-situ off-axis RF magnetron sputtering method.Finally using photolithography and ion etching technique again,the direct current superconducting quantum interference devices（dc-SQUIDs）were fabricated. We had conducted some experiments on our dc-SQUIDs.We first measured the I-V characteristic curves using temperatures and magnetic fields as the varying parameters.We then measured the V-B periodic curves under different bias currents,temperatures and hole sizes.The results of our V-B characteristics confirms the phenomenon of flux quantization and demonstrated that the flux focusing factor decreases with the increase of the hole size of the dc-SQUIDs.