Double Exchange in Electron Doped Ca1-xYxMnO3 Manganites

Details Double Exchange in Electron Doped Ca1-xYxMnO3 Manganites Double Exchange in Electron Doped Ca1-xYxMnO3 Manganites

2000-10-19

arxiv.org/abs/cond-mat/0010295v5

Physics

Condensed Matter

8 pages, 10 figures, updated 07/05/00

Scientific paper

We have studied structural, magnetic and transport properties as a function of temperature and magnetic field in the electron doped manganite YxCa1-xMnO3, for 00. With a simple model where antiferromagnetic (AF) superexchange and ferromagnetic (FM) double exchange (DE) compete, we fit the experimental \chi(x, T) obtaining parameter values which indicate that the FM-DE interaction is about twice as intense as the AF interaction. In the ordered phase, the H-dependence of the magnetization M(x,T) is explained in terms of magnetic polarons. We propose that the displacement of the eg electrons (in the G-type AF background) causes the alignement of the polaron with H. Signatures of polaronic behavior were also found in the x and T dependence of the electric resistivity.

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