Strong magnetic fluctuations in transition metal oxides

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Title: Strong magnetic fluctuations in transition metal oxides
Author: Aeppli, G.; Lee, S.-H.; Broholm, C.; DiTusa, J.F.; Bao, W.
Abstract: Most magnets have long-range magnetic order when the thermal energy is less than the local magnetic exchange energy (T<|ΘCW|) effects such as reduced dimensionality and frustration, 1 however, can suppress the ordering transition and lead to unusual cooperative paramagnetic phases at low temperatures. We review neutron scattering experiments exploring such short-range-ordered phases in insulating transition metal oxides. We discuss (V1-xCrx)2O3, in which orbital fluctuations appear to limit spin correlations to within small “molecular” clusters, SrCr9pGa12-9pO19, in which geometrical frustration allows local antiferromagnetic constraints to be fulfilled without long-ranged order, and Y2BaNiO5, in which magnetic interactions occur only within chains of spins which are unable to order because of the Haldane effect. Emphasis is placed on the common features of exchange interactions in these oxides and the important role which magnetic neutron scattering has played in understanding the unusual magnetic phenomena.
Date: 1996-04-15
Citation: Journal of Applied Physics, 15 April 1996, vol.79, no.8, pt.2A, pp. 5023-8
Subject: antiferromagnetic materials
exchange interactions (electron)
insulating transition metal oxides
short-range-ordered phases
paramagnetic materials
local antiferromagnetic constraints
spin correlations
reduced dimensionality
orbital fluctuations
long-range order
short-range order
magnetic transitions
geometrical frustration
ordering transition
cooperative paramagnetic phases

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