Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/98885
Type: Artigo de periódico
Title: Short-range-order Effects On The Esr Spectra Of A Spin Cluster
Author: Stein A.M.
Cabrera G.G.
Falicov L.M.
Abstract: Using the Kikuchi counting for the Ising problem, we present a theory which takes into account short-range-order effects in the formation of spin clusters. The Weiss molecular-field treatment is thus improved, since partial spin alignment is allowed in the paramagnetic phase. The above approach is used to study the influence of short-range order on the electron-spin-resonance (ESR) spectra of a spin system. Two main effects are then predicted: (i) One is related to a shift of resonances towards higher frequencies when the temperature is lowered. This effect is induced by effective local fields generated by short-range order. (ii) The other deals with multiple splitting of lines as a manifestation of transitions between states corresponding to different cluster configurations. These results are in good qualitative agreement with experiments. © 1981 The American Physical Society.
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Rights: aberto
Identifier DOI: 10.1103/PhysRevB.23.4391
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-10144220196&partnerID=40&md5=e85ffd8034a49f03eefc9e759689294f
Date Issue: 1981
Appears in Collections:Unicamp - Artigos e Outros Documentos

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