Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/137755
Title: STRONG ELECTRON-PHONON INTERACTION AND COLOSSAL MAGNETORESISTANCE IN EUTIO3
Authors: CHEN RUOFAN
Keywords: Colossal Magnetoresistance, Strong Electron-Phonon Interaction, Europium Titanate, Dynamical Mean-field Theory, Linear Responce
Issue Date: 3-Aug-2017
Source: CHEN RUOFAN (2017-08-03). STRONG ELECTRON-PHONON INTERACTION AND COLOSSAL MAGNETORESISTANCE IN EUTIO3. ScholarBank@NUS Repository.
Abstract: At low temperatures, EuTiO3 system has very large resistivities and exhibits colossal magnetoresistance. Based on a first principle calculation and the dynamical mean-field theory for small polaron we have calculated the transport properties of EuTiO3 . It is found that due to electron-phonon interaction the conduction band may form a tiny polaronic subband which is close to the Fermi level. The tiny subband is responsible for the large resistivity. Besides, EuTiO3 is a weak antiferromagnetic material and its magnetization would slightly shift the subband via exchange interaction between conduction electrons and magnetic atoms. Since the subband is close to the Fermi level, a slight shift of its position gives colossal magnetoresistance.
URI: http://scholarbank.nus.edu.sg/handle/10635/137755
Appears in Collections:Ph.D Theses (Open)

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