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김문석(M. S. Kim),유성초(S. C. Yu),임우영(W. Y. Lim),백종성(J. S. Baek) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.3
Magnetic properties of grain aligned high Tc Y₁Ba₂Cu₃O_(7-y) superconductor are inverstigated. Grain-aligned superconductors have magnetic anisotropy in the Cu-O layer like single crystals. The lower critical field H_(c1). measured at the temperature range of 2 K up to 77 K, is found to be decreasing linearly as temperature goes up. Moreover, it decreaes more rapidly when the Cu-O layer is perpendicular to the external magnetic field. The temperature dependence of the magnetic susceptibility shows that the value of magnetic susceptibility, 4n X, is close to -1 at low temperature. The intra grain critical current density Jc, obtained from the Bean's critical state model, is found to be comparable to that of single crystal superconductors.