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Physical properties and critical phenomena in strong correlated systems.

Grant number: 10/18364-0
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2011
Effective date (End): February 28, 2015
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:José Antonio Souza
Grantee:Fabian Enrique Nima Ramirez
Host Institution: Centro de Ciências Naturais e Humanas (CCNH). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil


The study of doped transition metal oxides with strong correlated physical properties is among the main research fields in condensed matter. The richness of physical properties observed on these materials is due to the strong correlation between spin, charge, and lattice degrees of freedom. In this project, two families of doped manganese oxides are of interest: the manganites R1-xAxMnO3 and multiferroic RMn2O5 (R = rare earth; A = Alkaline) compounds. In general, all the important physical effects are much more pronounced in the vicinity of a phase transition (magnetic, electronic, or structural), where an application and/or alteration of the thermodynamic parameters (structure, magnetization, heat capacity, electrical and thermal transport) change the balance between phases or correlation length depending on the nature of each phase transition. Therefore, one of the aims of this project is to perform a systematic study of the physical properties in the vicinity of the phase transition observed on those two families. Furthermore, the electrical transport mechanism at high temperature is also of interest. To accomplish this task, a homemade apparatus with this capability will be build.

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Scientific publications (7)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
RAMIREZ, FABIAN E. N.; PASCA, GABRIEL A. C.; SOUZA, JOSE A.. Possible misleading interpretations on magnetic and transport properties in BiFeO3 nanoparticles caused by impurity phase. Physics Letters A, v. 379, n. 24-25, p. 1549-1553, . (10/18364-0, 13/16172-5)
RAMIREZ, FABIAN E. N.; FRANCISQUINI, ELTON; SOUZA, JOSE ANTONIO. Nature of short-range order in the paramagnetic state of manganites. Journal of Alloys and Compounds, v. 571, p. 21-24, . (09/18618-5, 10/18364-0)
NIMA RAMIREZ, FABIAN ENRIQUE; FERREIRA, FABIO FURLAN; ALVES, WENDEL ANDRADE; QUEIRUGA REY, JOSE FERNANDO; SOUZA, JOSE ANTONIO. Magnetic, structural, and transport properties at very high temperature in manganites. Journal of Magnetism and Magnetic Materials, v. 324, n. 13, p. 2011-2018, . (09/18618-5, 10/18364-0)
SOUZA, J. A.; CRIADO, D.; ZUNIGA, A.; MIRANDA, V. N.; RAMIREZ, F. E. N.; MASUNAGA, S. H.; JARDIM, R. F.. Enhanced ferromagnetism in CuO nanowires on the top of CuO nanograins. Journal of Applied Physics, v. 114, n. 17, . (09/18618-5, 10/18364-0, 13/16172-5)
RAMIREZ, F. E. N.; MARINHO, JR., E.; LEAO, C. R.; SOUZA, J. A.. Comprehensive theoretical and experimental study of electrical transport mechanism on BiFeO3 multiferroic nanoparticles. Journal of Alloys and Compounds, v. 720, p. 47-53, . (16/09769-3, 10/18364-0)
RAMIREZ, F. E. N.; ESPINOSA, E. E.; PEDROZA, LUANA S.; SOUZA, J. A.. Humidity sensing effect in Bi25FeO39 sillenite-like compound. Journal of Materials Science, v. 51, n. 24, p. 10982-10989, . (16/09769-3, 10/18364-0, 13/16172-5)
RAMIREZ, FABIAN E. N.; SOUZA, JOSE ANTONIO. The Non-Adiabatic Polaron Model Revisited. Brazilian Journal of Physics, v. 44, n. 4, p. 308-314, . (09/18618-5, 10/18364-0)

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