Righi-Leduc

Nernst coefficient, Ettingshausen coefficient, Righi-Leduc coefficient,... 

Equation (16.10.12b) shows that the establishment of a longitudinal temperature gradient gives rise to a transverse one. This interrelation is known as the Righi-Leduc effect. It is convenient to rewrite (16.10.12b) as... 

When a heat current is made to flow in a conductor perpendicular to a magnetic field, in addition to the electric field produced by the Nernst effect, one also observes a transverse temperature gradient which is perpendicular to both the heat current and the magnetic field (Fig. Id). This effect was independently observed in 1888 by Righi and Leduc. The Righi-Leduc coefficient is defined by... 

To corroborate this remark, it is worth making a comparison with the Righi -Leduc effect, called thermal Hall effect, which is the equivalent of the Hall effect, but here it is a temperature gradient that appears under the effect of a electromagnetic field (instead of a gradient of electric potential) (Nolas et al. 1962). If one makes the analogy with the explanation found in textbooks, one should have an accumulation of entropy (heat) on one side. However, entropy is not known to be sensitive to a thermal field for producing a force ... 

The Righi-Leduc effect is not treated in this book but other thermoelectric effects are tackled in Chapter 12.)... 

Thermomagnetic effects kik B) kik, thermal km, Leduc-Righi kikim, magnetothermal kjkjmy, second-order... 

For other point groups this analysis of the symmetry properties of a 7 (3)ax can be repeated, or alternatively tables given by Bhagavantam (1966) or Nowick (1995) may be consulted. The Hall tensor pM (and likewise the Leduc-Righi tensor kud) is also a T(3)ax tensor but differs from the Nemst tensor in that pik is symmetric and pi1d Bt pk,i(—Bi) so that the blocks P uc,i are antisymmetric with respect to i < > k. This follows from the ORRs and is... 

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