本文根据两带Ginzburg-Landau理论对两能隙超导体的上临界磁场进行了研究,得到了上临界磁场随温度变化关系的精确解.并将所得的理论结果与中心对称超导材料CsNi2 Se2及非中心对称超导材料LaNiC2的实验数据进行对比,两者符合得极好,充分说明了这两种镍基材料CsNi2Se2和LaNiC2的两能隙超导特征.同时理论分析结果也说明两带Ginzburg-Landau理论对描述中心对称和非中心对称的两能隙超导体均适用.
Based on two-band Ginzburg-Landau theory,we study the upper critical field for two-gap superconductors.The exact solution on the temperature dependence of upper critical filed is obtained.All the theoretical results are consistent with the experimental data of centrosymmetric superconductor CsNi2 Se2 and noncentrosyrmmetric superconductor LaNiC2 in a broad temperature range.Our calculations thus show strong evidence that two-gap scenario is better to account for the superconductivity of CsNi2Se2 andLaNiC2.Moreover,our analysis also indicates that the two-band Ginzburg-Landau theory can be applied to both centrosymmetric and noncentrosymmetric two-gap superconductors.
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