On the influence of heat transport on low- frequency paramagnetic spin-Lattice relaxation experiments

Flokstra, J. and Gerritsma, G.J. and Hartemink, G.A. and Marel van der, L.C. (1974) On the influence of heat transport on low- frequency paramagnetic spin-Lattice relaxation experiments. Physica, 77 (1). pp. 99-120. ISSN 0031-8914

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Abstract:	In low-frequency relaxation experiments on paramagnetic crystals, placed in liquid helium, often dispersion- and absorption curves are found, strongly deviating from those following from the thermodynamic theory of Casimir and Du Pré. For the relaxation time τabs, related to the maximum in the absorption curve, a temperature dependence τabs αT-α with 1 < α < 6 has been found frequently, accompanied sometimes with a jump at the helium-transition temperature Tλ. We computed, starting from a model including the heat conduction of lattice and helium bath and a heat resistance from crystal to bath, dispersion- and absorption curves and found that, assuming the direct process for the spin—lattice relaxation, τabs(T) (related to the maximum of the calculated absorption curve) can be described roughly as mentioned above with a jump at Tγ.
Item Type:	Article
Copyright:	© 1974 Elsevier Science
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/68195
Official URL:	http://dx.doi.org/10.1016/0031-8914(74)90278-X
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