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中国物理学会期刊

非过渡金属非晶态超导电性的研究

CSTR: 32037.14.aps.33.639

STUDY ON SUPERCONDUCTIVITY OF AMORPHOUS NON-TRANSITION METALS

CSTR: 32037.14.aps.33.639
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  • 本文中分析了非过渡金属非晶态超导体的超导参量、声子谱参量与霍耳系数之间的经验关系。研究了非晶态超导体的Tc,并得出,声子谱的软化所导致的Tc的提高幅度与电-声子耦合常数λ的提高幅度成线性关系;声子谱的高频截止频率愈高,其Tc也愈高。讨论了利用声子谱的软化虽然能大幅度地提高Tc值,但要获得包括金属Be在内的非过渡金属的高Tc非晶态超导体的希望是渺茫的。还讨论了非晶态超导体的上临界场Hc2和能隙2Δ0所表现出的强耦合效应等问题。

     

    In this work, the empirical dependances of superconducting parameters and phonon spectrum parameters on the Hall Coefficient,and the problem on the Tc in amorphous non-transition metals are studied. It is found that the relative rise of Tc depends linearly upon the relative increase of λ and the Tc increases with the increase of the cut-off frequency ( ω0 ) of the phonon spectrum. In addition, although the Tc for non-transition metals can be raised by softening phonon spectrum, but there is slim hopes to obtain amorphous superconductor having high Tc for non-transition metals including metal Be. The description of electron properties and strong coupling effects which present in upper critical field Hc2 and energy gaps, 2△0 , of amorphous superconductors are also discussed.

     

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