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Neutron Brillouin scattering with pulsed spallation neutron source - spin-wave excitations from ferromagnetic powder samples -

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arxiv 1209.1780 v1 pith:7LCPNAEQ submitted 2012-09-09 cond-mat.str-el

Neutron Brillouin scattering with pulsed spallation neutron source - spin-wave excitations from ferromagnetic powder samples -

S. Itoh , Y. Endoh , T. Yokoo , D. Kawana , Y. Kaneko , Y.Tokura , M. Fujita This is my paper
classification cond-mat.str-el
keywords neutronscatteringspin-wavebrillouinexcitationsferromagneticpulsedsource
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Neutron Brillouin scattering (NBS) method was developed using a pulsed spallation neutron source, and the feasibility of NBS was demonstrated by observing ferromagnetic spin waves in La$_{0.8}$Sr$_{0.2}$MnO$_3$ and SrRuO$_3$ powders. Gapless spin-wave excitations were observed in La$_{0.8}$Sr$_{0.2}$MnO$_3$, which were continuously extended to the lower scattering vector $Q$ from previous results using single crystals. The novel result is a well-defined quadratic $Q$ dependence in the spin-wave dispersion curve with a large energy gap in SrRuO$_3$ indicating robust spin-orbit coupling.

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