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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2004

Magnetoelastic polarons in the hole-doped quasi-one dimensional model system Y2-xCaxBaNiO5

Résumé

Charge transport in the hole-doped quasi-1D model system Y$_{2-x}$Ca$_x$BaNiO$_5$ (x $\\leq$ 0.15) is investigated in the 50-300 K temperature range. The resistivity temperature dependence is characterized by a constant activation energy $E_{a}/k_{B}\\sim$ 1830 K at room temperature while $E_{a}$ decreases upon cooling. We suggest that $E_{a}$ measures the binding energy of the doped holes which form magneto-acoustic polarons when polarizing the neighboring Ni spins. A semi-classical model is proposed which allows to relate the electrical measurements and the bulk magnetic susceptibility. This model gives a picture of the spin-charge-lattice relation in this inhomogeneously doped quasi-1D system and explains its unusual one-particle charge excitation spectrum close to the Fermi level.
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Dates et versions

hal-00003219 , version 1 (04-11-2004)

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François-Xavier Lannuzel, Etienne Janod, Christophe Payen, Benoît Corraze, Daniel Braithwaite, et al.. Magnetoelastic polarons in the hole-doped quasi-one dimensional model system Y2-xCaxBaNiO5. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2004, 70, pp.155111. ⟨hal-00003219⟩
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