Strong electron–phonon interaction and colossal magnetoresistance in EuTiO3

Ruofan Chen (), Ji-Chang Ren, Km Rubi, Ramanathan Mahendiran and Jian-Sheng Wang
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Ruofan Chen: National University of Singapore
Ji-Chang Ren: National University of Singapore
Km Rubi: National University of Singapore
Ramanathan Mahendiran: National University of Singapore
Jian-Sheng Wang: National University of Singapore

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 2, 1-6

Abstract: 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.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1140/epjb/e2018-80536-8

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