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dc.titleEquilibrium susceptibilities of superparamagnets: Longitudinal and transverse, quantum and classical
dc.contributor.authorGarcía-Palacios, J.L.
dc.contributor.authorGong, J.B.
dc.contributor.authorLuis, F.
dc.identifier.citationGarcía-Palacios, J.L., Gong, J.B., Luis, F. (2009). Equilibrium susceptibilities of superparamagnets: Longitudinal and transverse, quantum and classical. Journal of Physics Condensed Matter 21 (45) : -. ScholarBank@NUS Repository.
dc.description.abstractThe equilibrium susceptibility of uniaxial paramagnets is studied in a unified framework which permits us to connect traditional results of the theory of quantum paramagnets, S = 1/2,1,3/2,⋯, with molecular magnetic clusters, S∼5,10,20 all the way up (S = 30,50,100,⋯,) to the theory of classical superparamagnets. This is done using standard tools of quantum statistical mechanics and linear-response theory (the Kubo correlator formalism). Several features of the temperature dependence of the susceptibility curves (crossovers, peaks, deviations from Curie law) are studied and their scalings with S identified and characterized. Both the longitudinal and transverse susceptibilities are discussed, as well as the response of the ensemble with anisotropy axes oriented at random. For the latter case a simple approximate formula is derived too, and its range of validity assessed, which could be used in the modelization of experiments. © 2009 IOP Publishing Ltd.
dc.description.sourcetitleJournal of Physics Condensed Matter
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