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The thermal conductivity of paramagnetic crystals in a magnetic field at low temperatures.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>1965
<mark>Journal</mark>Bulletin de l'Institute du Froid (Supplement)
Number of pages9
Pages (from-to)107-115
Publication StatusPublished
<mark>Original language</mark>English


The thermal conductivities of KMgF3 crystals doped with Ni2+ and Co2+ and crystals of cerium ethylsulphate have been measured in the temperature range 1 to 4.2 K and in magnetic fields up to 52 kilogauss. In all cases the conductivity changes which are observed may be qualitatively interpreted as being due to bands of phonons within a certain energy range being scattered by interaction with the spin system, the energy range being changed as the magnetic field is varied. For the Co2+ doping it is possible that interaction with pairs of Co ions is being observed, rather than with single ions. For the Ni2+ ions and the Co2+ pairs it would appear that in zero field the ground state doublet is separated from a higher singlet with a separation which has a spread of about 3 /cm. Cerium ethylsulphate has two low lying doublets whose g values are very different parallel and perpendicular to the hexagonal axis. The conductivity behaviour of crystals cut along these two axes is therefore quite different and this is briefly discussed.

Bibliographic note

Proceedings of the conference in Grenoble, 1965.