2000/10/19 by H. Aliaga, Aliaga, H., M.T. Causa +18
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Advanced Thermodynamics and Statistical Mechanics #Condensed Matter (cond-mat) #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #cond-mat
paper · pdf · doi:10.48550/arxiv.cond-mat/0010295
8 pages, 10 figures, updated 07/05/00
openalex publication_date 2000/10/19 · arxiv created 2001/09/13 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 χ(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.