MAGNETIC BEHAVIOR OF TYPE-II SUPERCONDUCTORS WITH SMALL GINZBURG-LANDAU PARAMETERS
MAGNETIC BEHAVIOR OF TYPE-II SUPERCONDUCTORS WITH SMALL GINZBURG-LANDAU PARAMETERS
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DOI：
10.1103/physrevb.7.136
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发表时间：
1973-01-01
影响因子：
3.7
通讯作者：
ULLMAIER, H
中科院分区：
文献类型：
--
作者：
AUER, J;ULLMAIER, H
κ≈为1的II型超导体在Hc1处表现出一级相变，这是由于磁通线之间的吸引相互作用所致。这种行为表现为通量密度从零到某个值B0的不连续增加。我们测量了B0随温度T的变化，金兹堡-朗道参数κ和杂质参数α=0.882ξ0 L，并确定了这些参数的临界值，低于这些临界值时，在Hc1处发生一级相变。我们进一步研究了参数κ1和κ2与L和T的关系，结果表明，只有当κ1(T)=1 2时，才能决定从I型到II型行为的转变。我们的实验结果与最近的理论处理相比较，只显示出定性的一致。
Type-II superconductors with κ≈ 1 exhibit a first-order phase transition at H c 1, which is due to an attractive interaction between flux lines. This behavior shows up as a discontinuous increase of the flux density from zero to a certain value B 0. We have measured B 0 as a function of temperature T, Ginzburg-Landau parameter κ, and impurity parameter α= 0.882 ξ 0 l, and have determined the critical values of these parameters below which a first-order transition occurs at H c 1. We further investigated the dependence of the parameters κ 1 and κ 2 on l and T, and we show that only the condition κ 1 (T)= 1 2 determines the transition from type-I to type-II behavior. Comparison of our experimental results with recent theoretical treatments shows only qualitative agreement.