A energia de Casimir e a energia de transição de fase Ferromagnética em Duplas Perovskquitas
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Data
2017-05-26
Autores
Rocha, Jefferson Rodrigues
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Universidade Federal do Espírito Santo
Resumo
This thesis is based on Bordag’s theory of Casimir energy. This proposal relates the Casimir energy between conductor plasma planes and the thermal energy in the transition in double ferromagnetic conductive perovskites. Using this association it was possible to calculate the critical temperature of Curie ???? relating the fraction of the energy between these materials and the parameters of Sommerfeld ?? of each compound. To evaluate experimentally our proposal we considered the transition temperatures ???? and the parameters of 3 samples: ????2??????????6,????2?? ????????6 e ????2?? ????????6.We have found that for these samples the distance ?? between the conducting planes is associated with the Curie temperature Tc. Our proposal for the calculation of ???? is consistent with the values found in the literature for samples with these characteristics (ferrometal and conductive). Based on our theory we proposed the preparation of a new sample that presented a parameter ?? similar to that of the sample ????2??????????6 thus generating a Curie temperature ???? ˜ 635??,namely:????1.8??0.2??????????6. This new compound is a double perovskite with ferromagnetic metallic characteristics and octahedral geometry formed by planes containing ??????6 and presenting ?? ?? = 635??.
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Superconductivity , Plasma conductors , Casimir Energy , Energia Casimir , Supercondutividade , Plasma condutores
Citação
ROCHA, Jefferson Rodriguez. A energia de Casimir e a energia de transição de fase Ferromagnética em Duplas Perovskquitas. 2017. 126 f. Tese (Doutorado em Física) – Universidade Federal do Espírito Santo, Centro de Ciências Exatas, Vitória, 2017.