CHARACTERISTIC CURVES OF M-H AND COEXISTENCE OF MAGNETISM WITH SUPERCONDUCTIVITY FOR HIGH Tc SUPERCONDUCTORS REBa2Cu3OT7-x
来源期刊：Journal of Rare Earths1990年第2期
论文作者：孙长勇 苏文辉 刘宏建 周建十 王法堂 张裕普
文章页码：104 - 109
摘 要：<正> Some high Tc superconductors REBa2Cu3O7-x（RE=Sm,Eu,Gd,Dy,Ho,Er,Tm） with zero resist-ance temperatures were about 90K have been prepared.The effect of magnetic rare earth ions on the transi-tion temperatures is not very great,but their magnetic behaviours are different from each other.Themagnetization loops of these compounds have been measured at 77K.The coexistence of superconductivitywith magnetic ordering （COSM） found in the samples with RE=Gd,Dy,Ho,Er,Tm,indicates that thereare two possible ways of coexistence in the samples.These expertments show that the relation ofparamagnetism to the atomtc number of rare earth elements for these superconductors is similar to that ofrare earth ions in some paramagnetic salt crystals,which indicates that the magnetism of the samples origi-nates from the local magnetic moments of rare earth ions.In some samples there is antiferromagnetie orderingat low temperatures,and the effective Bohr magneton numbers are consistent with that of free rare earth ions.Some superconducting parameters including the critical current density are calculated according toGinzburg-Landau theory and the critical state model.
孙长勇，苏文辉，刘宏建，周建十，王法堂，张裕普
摘 要：<正> Some high Tc superconductors REBa2Cu3O7-x（RE=Sm,Eu,Gd,Dy,Ho,Er,Tm） with zero resist-ance temperatures were about 90K have been prepared.The effect of magnetic rare earth ions on the transi-tion temperatures is not very great,but their magnetic behaviours are different from each other.Themagnetization loops of these compounds have been measured at 77K.The coexistence of superconductivitywith magnetic ordering （COSM） found in the samples with RE=Gd,Dy,Ho,Er,Tm,indicates that thereare two possible ways of coexistence in the samples.These expertments show that the relation ofparamagnetism to the atomtc number of rare earth elements for these superconductors is similar to that ofrare earth ions in some paramagnetic salt crystals,which indicates that the magnetism of the samples origi-nates from the local magnetic moments of rare earth ions.In some samples there is antiferromagnetie orderingat low temperatures,and the effective Bohr magneton numbers are consistent with that of free rare earth ions.Some superconducting parameters including the critical current density are calculated according toGinzburg-Landau theory and the critical state model.
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