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تسجيل مستخدم جديدDouble Exchange in Electron Doped Ca1-xYxMnO3 Manganites
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We 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, chi, 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 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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We present a study of the magnetic properties of the electron doped manganites Ca1-xYxMnO3 (for 0<=x<=0.25) in the paramagnetic regime. For the less doped samples (x<=0.1) the magnetic susceptibility, c(T), follows a Curie-Weiss (CW) law only for T >
450 K and, below this temperature, c^-1(T) shows a ferrimagnetic-like curvature. We approached the discussion of these results in terms of a simple mean-field model where double exchange, approximated by a ferromagnetic Heisenberg-like interaction between Mn3+ and Mn4+ ions, competes with classical superexchange. For higher levels of doping (x>=0.15), the CW behaviour is observed down to the magnetic ordering temperature (Tmo) and a better description of c(T) was obtained by assuming full delocalization of the eg electrons. In order to explore the degree of delocalization as a function of T and x, we analyzed the problem through Montecarlo simulations. Within this picture we found that at high T the electrons doped are completely delocalized but, when Tmo is approached, they form magnetic polarons of large spin that cause the observed curvature in c^-1(T) for x<=0.1.
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