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arXiv 2202.04254cond-mat.supr-con
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理解富氢超导体:有效质量和脏限的重要性

Understanding Hydrogen Rich Superconductors: Importance of Effective Mass and Dirty Limit

Andrew L. Cornelius, Keith V. Lawler, Ashkan Salamat

摘要:

一类富氢(H-rich)系统,符合II型超导性,已知具有非常高的超导转变温度Tc和上临界磁场Bc 2值(分别高达288 K和222 T)。通过观察迄今为止报道的所有实验性富氢超导体,大多数都处于脏极限,只有最高的Tc值处于清洁状态的交叉点。在此框架下,我们对一些以前无法解释的现象有了清楚的认识:(1)Bc_2随Tc的变化而出现极大值,(2)CSH中Tc随压力变化的斜率有明显的变化,(3)在零磁场下,超导转变的宽度随Tc的增加而减小,(4)在超导转变的临界温度下,Tc的变化与温度的变化有关。(4)在外加磁场中,超导宽度与磁场的斜率随Tc的增大而减小。Ginzburg-Landau-Abrikosov-Gorkov(GLAG)理论被用来解释所有这四种效应,在一个框架内,增加Tc与电子有效质量和散射长度的增加有关。

英文摘要:

A class of hydrogen-rich (H-rich) systems, consistent with Type II superconductivity, are known to have very high superconducting transition temperatures Tc and upper critical magnetic field Bc2 values (up to 288 K and 222 T respectively). By looking at all the experimental H-rich superconductors reported to date most are in the dirty limit, with only the highest Tc values being in the crossover to the clean regime. In this framework, there is a clear understanding of some previous unexplained behaviors: (1) A maximum in Bc2 as a function of Tc; (2) a clear change in slope in Tc as a function of pressure in CSH; (3) in zero magnetic field the width of the superconducting transition decreasing with increasing Tc; and (4) in applied magnetic field the slope of the superconducting width versus field decreasing with increasing Tc. Ginzburg-Landau-Abrikosov-Gorkov (GLAG) theory is used to explain all four of these effects within a framework where increasing Tc is related to increases in both the electron effective mass and scattering length.

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