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

Jakob Flokstra, G.J. Gerritsma, G.A. Hartemink, L.C. van der Marel

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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.
Original languageUndefined
Pages (from-to)99-120
JournalPhysica
Volume77
Issue number1
DOIs
Publication statusPublished - 1974

Keywords

  • IR-68195

Cite this

Flokstra, Jakob ; Gerritsma, G.J. ; Hartemink, G.A. ; van der Marel, L.C. / On the influence of heat transport on low- frequency paramagnetic spin-Lattice relaxation experiments. In: Physica. 1974 ; Vol. 77, No. 1. pp. 99-120.
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On the influence of heat transport on low- frequency paramagnetic spin-Lattice relaxation experiments. / Flokstra, Jakob; Gerritsma, G.J.; Hartemink, G.A.; van der Marel, L.C.

In: Physica, Vol. 77, No. 1, 1974, p. 99-120.

Research output: Contribution to journalArticleAcademic

TY - JOUR

T1 - On the influence of heat transport on low- frequency paramagnetic spin-Lattice relaxation experiments

AU - Flokstra, Jakob

AU - Gerritsma, G.J.

AU - Hartemink, G.A.

AU - van der Marel, L.C.

PY - 1974

Y1 - 1974

N2 - 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.

AB - 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.

KW - IR-68195

U2 - 10.1016/0031-8914(74)90278-X

DO - 10.1016/0031-8914(74)90278-X

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VL - 77

SP - 99

EP - 120

JO - Physica

JF - Physica

SN - 0031-8914

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