Thermal Hall effect
The thermal Hall effect is the thermal analog of the Hall effect. Here, a thermal gradient is produced across a solid instead of an electric field. When a magnetic field is applied, an orthogonal temperature gradient develops.
For conductors, a significant portion of the thermal current is carried by the electrons. In particular, the Righi–Leduc Effect describes the heat flow resulting from a perpendicular temperature gradient and vice versa, and the Maggi–Righi–Leduc effect describes changes in thermal conductivity when placing a conductor in a magnetic field.
A thermal Hall effect has also been measured in a paramagnetic insulator and dubbed the "phonon Hall effect." In this case, there are no charged currents in the solid so the magnetic field cannot exert a Lorentz force. An analogous thermal Hall effect for neutral particles exists in polyatomic gases (known as the Senftleben-Beenakker effect).
Measurements of the thermal Hall conducitivity are used to distinguish between the electronic and lattice contributions to thermal conductivity. These measurements are especially useful when studying superconductors.
- After the Italian physicist Augusto Righi (1850–1920) and the French physicist Sylvestre Anatole Leduc (1856–1937). See:
Lalena, John N.; Cleary, David A. (2010). Principles of Inorganic Materials Design (2nd ed.). John Wiley and Sons. p. 272. ISBN 0-470-40403-5. Retrieved 2011-04-25.
- Strohm, C.; G. L. J. A. Rikken, and P. Wyder1 (October 7, 2005). "Phenomenological Evidence for the Phonon Hall Effect". Physical Review Letters 95 (15): 155901. Bibcode:2005PhRvL..95o5901S. doi:10.1103/PhysRevLett.95.155901. PMID 16241740.
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