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Title: Equilibrium susceptibilities of superparamagnets: Longitudinal and transverse, quantum and classical
Authors: García-Palacios, J.L. 
Gong, J.B. 
Luis, F.
Issue Date: 2009
Citation: García-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.
Abstract: The 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.
Source Title: Journal of Physics Condensed Matter
ISSN: 09538984
DOI: 10.1088/0953-8984/21/45/456006
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