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Master's Dissertation
DOI
10.11606/D.43.1980.tde-09042015-143303
Document
Author
Full name
Sandra Sampaio Vianna
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1980
Supervisor
Committee
Becerra, Carlos Castilla (President)
Qualifik, Paul
Title in Portuguese
Efeitos de ordem de curto alcance na susceptibilidade paramagnética em sais antiferromagnéticos hidratados
Keywords in Portuguese
Ferromagnetismo
Física dos materiais
Física mecânica
Abstract in Portuguese
Neste trabalho, estudamos os efeitos de ordem de curto alcance resentes na suscetibilidade paramagnética, para temperaturas acima da temperatura de transição antiferro-paramagnética, nos seguintes materiais: CoCl2.6H2O, CoBr2.6H2O, NiCl2.4H2O, MnCl2.4H2O e MnBr2.4H2O. As caracterísitcas apresentadas por estes materiais permitiram a investigação da dependência deste efeito com o valor do spin, com a dimensionalidade e com o tipo de anisotropia do sistema magnético. Desenvolvemos, também, um tratamento teórico simples, baseado no princípio variacional da energia livre, o qual é suficiente para explicar os comportamentos observados em nossos estudos experimentais.
Title in English
Short-range order effects in the paramagnetic susceptibility in antiferromagnetic hydrated salts
Keywords in English
Ferromagnetism
Mechanical physics
Physics of materials
Abstract in English
In this work we have studied the effect of short-range ordering on the paramagnetic susceptibility, for temperatures above the antiferro-paramagnetic transition in the following materials: CoCl2.6H2O, CoBr2.6H2O, NiCl2.4H2O, MnCl2.4H2O and MnBr2.4H2O. The properties of by these materials permit the investigation of the dependence of this effect with the value of the spin, with the dimensionality and the anisotropy of the magnetic system. A simple theoretical treatment, based on variational principle of free energy, is developed, which accounts for most of the features observed in our experimental studies.
 
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Vianna_1980.pdf (3.25 Mbytes)
Publishing Date
2015-06-17
 
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