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Model study of physical properties of manganite system

机译:锰矿体系物理性质的模型研究

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The colossal magneto resistive (CMR) materials: the doped manganites exhibit strong correlations among the charges, spins, orbitals and the lattice. In this communication we present a microscopic theoretical model for the system and study the temperature variation of its magnetic susceptibility. The model Hamiltonian envisages Jahn Teller static lattice distortion in the e, band and treats the ferromagnetic interaction of the electrons in the core t(2g) levels within the mean-field approximation, while incorporating the possibility of hybridization between the two bands. The two particle electron Green's functions involved in the susceptibility are calculated by Zubarev's technique. Finally, the experimental results are discussed on the basis of the parameter dependence of the dynamic susceptibility of the system in the long wavelength limit and at finite temperature. (c) 2006 Elsevier B.V. All rights reserved.
机译:巨大的磁阻(CMR)材料:掺杂的锰矿在电荷,自旋,轨道和晶格之间表现出很强的相关性。在这次交流中,我们提出了该系统的微观理论模型,并研究了其磁化率的温度变化。哈密​​顿量模型在e带中设想了Jahn Teller静态晶格畸变,并在平均场近似范围内处理了核心t(2g)能级中电子的铁磁相互作用,同时考虑了两个带之间杂交的可能性。磁化率中涉及的两个粒子电子格林函数通过祖巴列夫的技术计算。最后,在长波长范围和有限温度下,根据系统动态磁化率的参数依赖性,讨论了实验结果。 (c)2006 Elsevier B.V.保留所有权利。

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