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在大部分非常规超导体中,准粒子激发谱中存在着“线节点”或“点节点”。这些节点的存在,导致热力学量和输运系数在低温区的温度变化呈现幂次律。解析分析表明,外加的弱Zeeman磁场会显著影响节点的结构。尤其是,预言在某些情况下Zeeman磁场可能在费米面上诱导出“面节点”。计算若干自旋单态和自旋三重态的电子比热,结果显示外加的弱Zeeman磁场对节点结构的影响会导致幂次律产生巨大变化。
In most unconventional superconductors, there are “nodal nodes ” or “nodal points ” in the quasi-particle excitation spectrum. The existence of these nodes leads to the power law of thermodynamic quantities and transport coefficients at low temperature. Analytical analysis shows that the applied weak Zeeman magnetic field will significantly affect the node structure. In particular, it is predicted that Zeeman magnetic fields may induce “nodal points ” on the Fermi surface in some cases. Calculating the electron specific heat of a number of spin singlet and spin triplet states, the results show that the influence of the applied weak Zeeman magnetic field on the node structure will lead to a huge power law change.