Spin Meissner effect in superconductors and the origin of the Meissner effectJ. E. Hirsch
Department of Physics, University of California, San Diego - La Jolla, CA 92093-0319, USA
received 9 January 2008; accepted in final form 30 January 2008; published March 2008
published online 28 February 2008
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 of the surface of superconductors in the absence of applied external fields, with carrier density = the superfluid density and carrier speed (me= bare electron mass). The two members of a Cooper pair circulate in orbits of radius in opposite direction and the spin current in a Cooper pair has orbital angular momentum . Our description also provides a "geometric" interpretation of the difference between type-I and type-II superconductors.
74.20.-z - Theories and models of superconducting state.
74.20.Mn - Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.).
71.70.Ej - Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect .
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