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arXiv 2202.04408cond-mat.supr-con
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超导体中的弛豫和非局部电阻率边界层

Relaxation and a non-local, resistivity boundary layer in superconductors

Harald Reiss

摘要:

与其他固体一样,超导体不能从热激发(扰动)状态瞬时弛豫到热力学平衡。本文模拟了多导体和薄膜超导体的热弛豫过程。辐射的吸收或在导体运动下机械张力的释放和转化为热能是例子。本文应用数值模拟超导体的能量状态,作为多粒子系统,在基本的热力学和标准,多组分传热原理(固体传导加辐射薄膜)。最近描述的微观稳定性模型和传统的连续体电池模型的应用允许解释在低于临界温度TCrit时电阻的曲率与温度偏移的关系,并提出了在超过TCrit的温度下电导率增加的标准解释的替代方案。在临界温度附近观察到非局部电阻率边界层(温度不确定性),在该温度内,电阻率曲线从超导状态平滑地接近正常导电电阻率。超导体;相变;弛豫;临界电流密度;临界温度;热涨落;边界层

英文摘要:

Superconductors like other solids cannot relax instantaneously from thermally excited (disturbed) states to thermodynamic equilibrium. In this paper, relaxation of a multi-filamentary and of a thin film superconductor from thermal excitations is simulated. Absorption of radiation or, under conductor movement, release and transformation of mechanical tension to thermal energy are examples. The paper applies numerical simulations of superconductor energy states, as many-particle systems, under basic thermodynamic and standard, multi-component heat transfer principles (solid conduction plus radiation in thin films). A recently described microscopic stability model and application of a traditional, continuum cell model allows to explain curvature of the resistance vs. temperature excursion below critical temperature, TCrit, and suggests an alternative to standard explanation of increased electrical conductivity at temperature exceeding TCrit. A non-local, resistivity boundary layer (a temperature uncertainty) is observed near critical temperature within which the resistivity curve smoothly approaches, from the superconducting state, the normal conduction resistivity. Keywords Superconductor; phase transition; relaxation; critical current density; critical temperature; thermal fluctuations; boundary layers

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