Dynamics of the Vortex Fluid in Cuprate Superconductors: the Nernst Effect

Details Dynamics of the Vortex Fluid in Cuprate Superconductors: the Nernst Effect Dynamics of the Vortex Fluid in Cuprate Superconductors: the Nernst Effect

2006-03-27

arxiv.org/abs/cond-mat/0603726v1

Physics

Condensed Matter

Superconductivity

Scientific paper

We calculate the Nernst effect in the vortex fluid phase, which occurs in the lower-T portion of the pseudogap region of the high Tc cuprate phase diagram. The dynamics is dominated by the flows due to both thermally excited vortices and those caused by the magnetic field; we show that the flow of the latter due to the thermal gradient encounters a viscous force caused by the random vortex flows. The temperature and field dependence is controlled by the effects of T and B on the momentum-dependent energy gaps and thence on the superfluid density. A reasonable level of agreement with the observational data is obtained, in view of the crudity of the assumptions.

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