论文部分内容阅读
Since the discovery of high-temperature superconductor YBa_2Cu_3O_7(YBCO) people aremuch concerned about its microwave surface resistance. It was found that although themicrowave surface resistance of c-axis oriented YBCO thin films is an order of magnitudelower than Cu, it is much higher than the value predicted by the BCS theory, and also the
Since the discovery of high-temperature superconductor YBa_2Cu_3O_7 (YBCO) people aremuch concerned about c-axis oriented YBCO thin films is an order of magnitudelower than Cu, it is much higher than the value predicted by the BCS theory, and also the