Double Exchange in Electron Doped Ca1-xYxMnO3 Manganites

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dc.creatorAliaga, H.
dc.creatorCausa, M. T.
dc.creatorButera, A.
dc.creatorAlascio, B.
dc.creatorSalva, H.
dc.creatorVega, M. Tovar D.
dc.creatorPolla, G.
dc.creatorLeyva, G.
dc.creatorKonig, P.
dc.date2000-10-19
dc.date2001-09-13
dc.date.accessioned2026-07-07T02:39:04Z
dc.date.available2026-07-07T02:39:04Z
dc.descriptionWe have studied structural, magnetic and transport properties as a function of temperature and magnetic field in the electron doped manganite YxCa1-xMnO3, for 0<x<0.25. We found that in the paramagnetic regime, the magnetic susceptibility, χ, deviates substantially from a Curie-Weiss law for x>0. 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.
dc.description8 pages, 10 figures, updated 07/05/00
dc.identifierhttps://arxiv.org/abs/cond-mat/0010295
dc.identifierhttp://arxiv.org/abs/cond-mat/0010295
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/16909
dc.subjectCondensed Matter
dc.titleDouble Exchange in Electron Doped Ca1-xYxMnO3 Manganites
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