Spin Meissner Effect in Superconductors and the Origin of the Meissner Effect

Details Spin Meissner Effect in Superconductors and the Origin of the Meissner Effect Spin Meissner Effect in Superconductors and the Origin of the Meissner Effect

2007-10-04

arxiv.org/abs/0710.0876v2

Europhys. Lett. 81, 67003 (2008)

Physics

Condensed Matter

Superconductivity

Interpretation of type I vs. type II behavior added (fig. 2)

Scientific paper

10.1209/0295-5075/81/67003

We propose a dynamical explanation of the Meissner effect in superconductors and predict the existence of a spin Meissner effect: that a macroscopic spin current flows within a London penetration depth $\lambda_L$ of the surface of superconductors in the absence of applied external fields, with carrier density = the superfluid density and carrier speed $v=\hbar/(4m_e\lambda_L$) ($m_e=$bare electron mass). The two members of a Cooper pair circulate in orbits of radius $2\lambda_L$ in opposite direction and the spin current in a Cooper pair has orbital angular momentum $\hbar$. Our description also provides a 'geometric' interpretation of the difference between type I and type II superconductors.

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