The magnetization properties of an YBa_(2)Cu_(3)O_(~7) superconducting ring were measured at about 80K.The critical field of most of weak couplings is readily obtained and is 170e for the material used.The current is ...The magnetization properties of an YBa_(2)Cu_(3)O_(~7) superconducting ring were measured at about 80K.The critical field of most of weak couplings is readily obtained and is 170e for the material used.The current is most likely distributed in the body of the specimen.The magnetization measurement of a ring-shape specimen may be a good method to study the characters of weak couplings in oxides superconductors.展开更多
The dependence of the effective penetration depthλe,on the external magnetic field in a high-Tc superconducter YBa2Cu3O7 has been measured by both dc and ac methods at liquid-nigtrogen temperature.It is found,thatλe...The dependence of the effective penetration depthλe,on the external magnetic field in a high-Tc superconducter YBa2Cu3O7 has been measured by both dc and ac methods at liquid-nigtrogen temperature.It is found,thatλe increases rapidly with increasing external field and is 0.13~0.15mm in macroscopic scale.The Hcl of the specimen,about 800e at 77K here,can be determined more reliably by comparing dcλe with acλe.The difference betweenλedc andλeac,and the jumping ofλedc may indicate the characters of superconducting glass.展开更多
基金Project supported by the National Science Foundation of China.
文摘The magnetization properties of an YBa_(2)Cu_(3)O_(~7) superconducting ring were measured at about 80K.The critical field of most of weak couplings is readily obtained and is 170e for the material used.The current is most likely distributed in the body of the specimen.The magnetization measurement of a ring-shape specimen may be a good method to study the characters of weak couplings in oxides superconductors.
基金Project suported by the National Science Fundation of China.
文摘The dependence of the effective penetration depthλe,on the external magnetic field in a high-Tc superconducter YBa2Cu3O7 has been measured by both dc and ac methods at liquid-nigtrogen temperature.It is found,thatλe increases rapidly with increasing external field and is 0.13~0.15mm in macroscopic scale.The Hcl of the specimen,about 800e at 77K here,can be determined more reliably by comparing dcλe with acλe.The difference betweenλedc andλeac,and the jumping ofλedc may indicate the characters of superconducting glass.
