金属小颗粒的超导电性

发布时间：2018-06-19 01:25

  本文选题：两带Richardson模型 + 金属小颗粒　； 参考：《低温物理学报》2017年04期

【摘要】：采用两带Richardson模型,用随机矩阵理论方法研究了具有高斯能级分布的金属小颗粒的超导电性,计算了系统的熵、比热跃变和超导临界磁场.结果表明,带间相互作用有利于系统的超导电性,带间相互作用越强,超导临界温度越高,超导临界尺寸越小.大的基态自旋S不利于系统的超导电性,基态自旋S越大,超导临界温度越低,超导临界尺寸越大.对于S≠0的自旋基态,随着颗粒尺寸的减小只存在超导衰减现象,而对于S=0的自旋基态,则先出现超导增强现象,随后出现超导衰减现象.理论结果与实验符合.
[Abstract]:Using a two-band Richardson model, the superconductivity of small metal particles with Gao Si energy level distribution is studied by means of stochastic matrix theory. The entropy, specific heat jump and superconducting critical magnetic field of the system are calculated. The results show that the interband interaction is favorable to the superconductivity of the system. The stronger the interband interaction is, the higher the superconducting critical temperature is and the smaller the superconducting critical size is. The larger the ground state spin S is, the lower the superconducting critical temperature is and the larger the superconducting critical size is. For the spin ground state with S 鈮，

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