The J-T Effect on Magnetization and Specific Heat of Manganite Systems
The manganite systems display colossal magnetoresistance (CMR) effect near the Curie temperature. In this present communication, we report a microscopic theoretical model showing the influence of static band Jahn-Teller (BJT) distortion effect on the itinerant eg electron magnetization and its effect on other physical properties. The model Hamiltonian consists of BJT distortion in eg band, the double exchange interaction between the spins of core electrons and the e g electrons, besides the Heisenberg spin–spin interaction among the core electrons. In order to study the interplay, the lattice strain, the magnetization of e g and core electrons are calculated from the electron Green's functions using Zubarev's technique and solved self consistently. The effect of J-T coupling, exchange coupling, Heisenberg coupling and the external magnetic field on the e g electron magnetization and temperature dependent electronic specific heat is studied by varying these parameters. The results are discussed based on the experimental observations.
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Document Type: Research Article
Publication date: February 1, 2016
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