發(fā)布時間：2018-06-19 01:25

  本文選題：兩帶Richardson模型 + 金屬小顆粒　； 參考：《低溫物理學報》2017年04期

【摘要】：采用兩帶Richardson模型,用隨機矩陣理論方法研究了具有高斯能級分布的金屬小顆粒的超導電性,計算了系統(tǒng)的熵、比熱躍變和超導臨界磁場.結果表明,帶間相互作用有利于系統(tǒng)的超導電性,帶間相互作用越強,超導臨界溫度越高,超導臨界尺寸越小.大的基態(tài)自旋S不利于系統(tǒng)的超導電性,基態(tài)自旋S越大,超導臨界溫度越低,超導臨界尺寸越大.對于S≠0的自旋基態(tài),隨著顆粒尺寸的減小只存在超導衰減現象,而對于S=0的自旋基態(tài),則先出現超導增強現象,隨后出現超導衰減現象.理論結果與實驗符合.
[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，

本文編號：2037709