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High Temperature Superconductivity and Low Temperature Antiferromagnetic Ordering in the Rare Earth RBa2Cu3O7-x System
並列摘要
Meissner effect measurements (fieldcooled) for both powder and bulk samples of superconducting compound YBa2Cu3O7(Tc=94 K) show 40% of the perfect diamagnetic signal. This bulk but not perfect value can be attributed to the combined effects of small grain size, large penetration depth, small coherence length, field trapping and sample inhomogeneity. No superconducting transition can be detected in four rare earth compounds RBa2Cu3O7-x (R=SC, Ce, Pr, Tb). The occurrence of low temperaure antiferromagnetic ordering in six magnetic rare earth compounds (R=Nd, Sm, Gd, Dy, Ho, Er) with almost no superconducting pair-breaking effect indicates that the meachanism for this low temperature magnetic ordering probably originates from dipole-dipole and/or superexchange interaction.
並列關鍵字
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