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测量了 (YBa2 Cu3 O7) 2 4/(PrBa2 Cu3 O7) 2 多层膜在强磁场下的超导转变展宽 .这种YBa2 Cu3 O7层间具有耦合 退耦合的临界绝缘层PrBa2 Cu3 O7厚度以及由 3D向 2D过渡的YBa2 Cu3 O7层厚度的多层膜 ,其不可逆场遵守H ∝ ( 1 -t)μ关系 ,其 μ值约为 1 ,介于 3D( μ =3/2 )和 2D( μ =1 /2 )之间 .磁通运动的热激活能的结果表明 ,对于H∥c和H⊥J的磁场位形 ,遵守U∝lnH关系 ,即磁通涡旋处于 2D区 .而对于H∥ab和H⊥J ,H∥ab和H∥J两种磁场位形 ,激活能U随磁场的增加而线性减小 ,表明磁通涡旋处于 3D态 .讨论了上述维度变化的可能物理机制 .
The superconducting transition broadening of (YBa2 Cu3 O7) 2 4 / (PrBa2 Cu3 O7) 2 multilayers under strong magnetic field was measured. The thickness of the critical insulating layer of PrBa2 Cu3 O7 with coupling decoupling between YBa2 Cu3 O7 layers and The multilayers of YBa2 Cu3 O7 layers with 3D to 2D transitions have an irreversible field in the Hα (1-t) μ relationship with a μ of about 1, which is between 3D (μ = 3/2) and 2D = 1/2) .The results of the heat activation energy of the flux movement show that for the H∥c and H⊥J magnetic field configurations, the relationship of UαlnH is obeyed, that is, the flux vortex is in the 2D region, while for H ∥ab and H⊥J, H∥ab and H∥J, the activation energy U decreases linearly with the increase of the magnetic field, indicating that the flux vortex is in the 3D state.The possible physical mechanism of the above dimensional changes .