论文部分内容阅读
自从Bednorz和Muller发现高T_C氧化物超导体以来,已有几种系列含Cu氧化物超导体,如YBaCuO、BiSrCaCuO以及R1BaCaCuO等。这些超导体的正常态的Hall系数和热电动势都表明它们是空穴导电型的超导体。由于它们具有高于液氮温度的超导电性,因而具有广阔的应用前景。但是这些氧化物超导体是陶瓷,常规方法制备这些材料,其密度低,机械强度差,并且这些多晶超导材料的临界电流往往也不高。这些因素都限制了这类材料的
Several series of Cu-containing oxide superconductors, such as YBaCuO, BiSrCaCuO, and R1BaCaCuO, have been available since Bednorz and Muller discovered high T_C oxide superconductors. The Hall coefficients and thermoelectromotive forces of the normal states of these superconductors all indicate that they are hole-conduction type superconductors. Because of their superconductivity above liquid nitrogen temperature, they have broad application prospects. However, these oxide superconductors are ceramics that are conventionally prepared, have low density, poor mechanical strength, and often have low critical currents for these polycrystalline superconducting materials. These factors limit these materials