Anharmonic effects in magnetoelastic chains
نویسندگان
چکیده
منابع مشابه
Excitation of travelling multibreathers in anharmonic chains
We study the dynamics of the “externally” forced and damped Fermi–Pasta–Ulam (FPU) 1D lattice. The forcing has the spatial symmetry of the Fourier mode with wavenumber p and oscillates sinusoidally in time with the frequency ω. When ω is in the phonon band, the p-mode becomes modulationally unstable above a critical forcing, which we determine analytically in terms of the parameters of the syst...
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The contributions to the dynamic form factor S(Q, U) arising from interference between its one-phonon and multiphonon parts have been observed in the scattering of neutrons from potassium. Interference makes two qualitatively distinct contributions to S(Q, U). One is approximately proportional to the one-phonon part, S,(Q, U), and as a result contributes scattering intensity largely within the ...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2011
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.83.224406