CRITICAL BEHAVIOUR OF A TWO-DIMENSIONAL ANTIFERROMAGNET : NUCLEAR MAGNETIC RESONANCE MEASUREMENTS

1 February 1971

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

Vol. 32 (C1) , C1-887
https://doi.org/10.1051/jphyscol:19711314

Abstract

Nuclear Magnetic Resonance of F19 in K2CoF4 exhibits two resonances one corresponding to F ions with a single Co ion neighbour (FI) and one corresponding to F ion with two neighbouring Co ions. Line-shift and line-widths of both lines have been measured at various temperatures and crystal orientations between 80 °K and 300 °K. A critical temperature has been found at Tc = 107,44 °K. The FI linewidth divergence when approaching Tc from above is described by the power law Ɗν∝(T - TN)1.52±.03. The exponent agrees with the calculated value for a two-dimensional Ising antiferromagnet

Keywords

CRITICAL BEHAVIOUR
RESONANCE MEASUREMENTS
DIMENSIONAL ANTIFERROMAGNET
MAGNETIC RESONANCE
TWO DIMENSIONAL
NUCLEAR MAGNETIC

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