Magnetic Interaction and Phase Transition in the Organic Free Radical TANOL in Hydrostatic Pressures

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Abstract
Hydrostatic pressure dependence of the magnetic transition temperature T N ( p ) and interactions in the organic free radical TANOL(2,2,6,6-tetramethyl-4-piperidinol-1-oxyl), a quasi-one-dimensional Heisenberg antiferromagnet, has been studied by the heat capacity measurements in the pressure range p T N ( p 0 ))d T N ( p )/d p ≃0.15 kbar -1 , (1/ J ( p 0 ))d J ( p )/d p ≃0.076 kbar -1 and (1/ J '( p 0 ))d J '( p )/d p ≃0.22 kbar -1 obtained here turn out to be the largest of the corresponding values in the magnetic systems ever studied, where J ( p ) and J '( p ) are the intra- and inter-chain interaction constants, respectively ( p 0 ≃0.001 kbar). The dependence of these interactions on the distance between the adjacent magnetic spins is suggested much stronger than the usual 10-th power law for the superexchange mechanism in inorganic magnetic systems.

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