On the heat current in the magnetic field: Nernst-Ettingshausen effect above the superconducting transition

Details On the heat current in the magnetic field: Nernst-Ettingshausen effect above the superconducting transition On the heat current in the magnetic field: Nernst-Ettingshausen effect above the superconducting transition

2006-07-25

arxiv.org/abs/cond-mat/0607662v2

Physics

Condensed Matter

Superconductivity

4 pages, 1 figures 2nd version includes discussion of the Onsager relation

Scientific paper

For maintaining gauge invariance in a magnetic field, the heat current operator should include the magnetic term. Taking this term into account, we revised calculations of the Nernst-Ettingshausen effect above the superconducting transition. We found that the fluctuations of the modulus of the order parameter do not change the particle-hole asymmetry (PHA) of the thermomagnetic effects. As in the normal state, the thermomagnetic effects in the fluctuation region are proportional to the square of PHA and, therefore, small. Large Nernst effect observed in the high-$T_c$ cuprates requires vortex-like excitations due to the phase fluctuations, which are beyond the Gaussian-fluctuation theory.

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