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The J-T Effect on Magnetization and Specific Heat of Manganite Systems

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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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Keywords: COLOSSAL MAGNETORESISTANCE; JAHN-TELLER DISTORTION; SPIN-PHONON INTERACTION

Document Type: Research Article

Publication date: February 1, 2016

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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