Magnetic Scattering of Phonons in the Thermal Conductivity of MnCl2·4H2O

The thermal conductivity of the antiferromagnet MnCl2·4H2O has been measured from 3° to 0.25°K with particular attention to the region of the Néel point (TN = 1.62°K). The effects of magnetic scattering are separated from the thermal resistance arising from nonmagnetic processes by comparing the the...

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Bibliographic Details
Published in:Journal of applied physics 1970-03, Vol.41 (3), p.1435-1436
Main Authors: Rives, J. E., Walton, D., Dixon, G. S.
Format: Article
Language:eng ; jpn
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Summary:The thermal conductivity of the antiferromagnet MnCl2·4H2O has been measured from 3° to 0.25°K with particular attention to the region of the Néel point (TN = 1.62°K). The effects of magnetic scattering are separated from the thermal resistance arising from nonmagnetic processes by comparing the thermal conductivity measured in a magnetic field of 40 kOe with that measured in zero applied field. It is found that in the paramagnetic phase there is no critically enhanced phonon scattering associated with the magnetic ordering transition. In the ordered phase the magnetic contribution to the scattering has a maximum near 0.75°K and diminishes as the transition is approached. Detailed comparison with theoretical predictions is made, and the relationship of this work to recent measurements of thermal expansion and specific heat is discussed.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1658978