Spin excitations in ferromagnetic manganites
J. Loos, H. Fehske
TL;DR
This paper constructs an effective Hamiltonian for CMR manganites to analyze spin excitations, fitting experimental data to determine electron hopping parameters consistent with band calculations.
Contribution
It introduces a new effective one-band Hamiltonian specifically for CMR manganites and accurately fits experimental spin-wave data.
Findings
Electron hopping amplitude estimated at 0.2 eV
Spin-wave dispersion matches experimental data
Results align with LDA band calculations
Abstract
An effective one-band Hamiltonian for colossal-magnetoresistance (CMR) manganites is constructed and the spin excitations are determined. Fitting the experimental data by the derived spin-wave dispersion gives an e_g -electron hopping amplitude of about 0.2 eV in agreement with LDA band calculations.
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