TWO-DIMENSIONAL HEISENBERG FERROMAGNET : SUSCEPTIBILITY

1 February 1971

journal article
Published by EDP Sciences in Le Journal de Physique Colloques

Vol. 32 (C1) , C1-880
https://doi.org/10.1051/jphyscol:19711311

Abstract

The magnetic susceptibility χ has been measured of the ferromagnetic layer-type Cu-compounds Cu(CnH2n+1NH3)2Cl4, n varying from, 1-10, and of isomorphous Br-compounds. Transition temperatures Tc have been found at which anomalies in χ occur. For most of the Cl-compounds Tc ≈ 7.5 °K, for the Br-series Tc ≈ 11 °K, while the unit-cell varies with a factor 3 through these series. The data in the paramagnetic region may be fitted quite well to the series-expansion result for χ. From these fits values for the exchange-constants J/k have been derived. The consequences of the so obtained J/kTc -values with respect to the possible existence of a phase-transition for the 2-dimensional Heisenberg ferromagnet are discussed

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