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고온 초전도체 Y₁Ba₂Cu₃-xSnxO7-y의 자기적 특성 연구
이성규(Seong-Kyu Lee),이주일(Joo-Il Lee),김문석(Mun-Seog Kim),유성초(Seong-Cho Yu),임우영(Woo-Young Lim),백종성(Jong-Sung Beak) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.2
The magnetic properties of the Y₁Ba₂Cu_(3-x)Sn_xO_(7-y) superconductor were studied as a function of Sn concentration by utilizing both the vibrating sample magnetometer (VSM) and torque magnetometer. Unlike the cases where Fe and Co were substituted for Cu, the superconducting transition temperature was maintained above 90 K until x reached the value of 0.36. The lower critical field H_(C1)(T) and upper critical field H_(C2)(T) are measured as a function of temperature and external magnetic field, respectively. By aid of these results, H_(C1)(0), H_(C2)(0), the coherence length ε_0, the penetration depth λ_0, and the Ginzburg-Landau parameter к were obtained. Flux pinning was also observed in the sample.