Spin Dynamics of Double-Exchange Manganites with Magnetic Frustration

Abstract

This work examines the effects of magnetic frustration due to competing ferromagnetic and antiferromagnetic Heisenberg interactions on the spin dynamics of the double-exchange model. When the local moments are non-colinear, a charge-density wave forms because the electrons prefer to sit on lines of sites that are coupled ferromagnetically. With increasing hopping energy, the local spins become aligned and the average spin-wave stiffness increases. Phase separation is found only within a narrow range of hopping energies. Results of this work are applied to the field-induced jump in the spin-wave stiffness observed in the manganite Pr${}_{1-x}$Ca${}_x$MnO${}_3$ with $0.3\le x\le 0.4$.

10 pages, 3 figures

References in corpus (5)

• Microphase separation in Pr0.67Ca0.33MnO3 by small angle neutron scattering
• Field dependence of the electronic phase separation in Pr0.67Ca0.33MnO3 by small angle magnetic neutron scattering
• Magnetic-field-induced collapse of charge-ordered nanoclusters and the Colossal Magnetoresistance effect in Nd(0.3)Sr(0.3)MnO(3)
• Spin Diffusion in Double-Exchange Manganites
• Spin Waves, Phase Separation, and Interphase Boundaries in Double Exchange Magnets

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