Twins and properties of classical and high-Tc superconductors

✍ Scribed by V.S Bobrov; M.A Lebyodkin

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 388 KB
• Volume: 164
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/0921-5093(93)90710-v

✦ Synopsis

Data on the influence of twins and other crystalline defects on the properties of classical and high-T c superconductors are presented. It is concluded that the increase in T c and H c due to the low temperature twinning of classical superconductors is related to the formation of localized superconducting states in the region of twin boundaries. A crossover was observed of the temperature dependence of the critical current I~(T) near T~ of YIB2C3OT_x ceramics and single crystals. It was shown that in the case of ceramics this is possibly connected with the existence of Josephson junctions in the grain boundary region. The reasons which may cause deviation of I¢(T) in Y1B2C307_ ~ single crystals from linearity are discussed, in particular a possible analogy between the influence of twin boundaries on the properties of high-T c and classic superconductors.