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cos a sin a 0
The secondorder term in m has been neglected
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absorption amplitude angle angular anisotropy antiferromagnetic approximation assume atoms axis band calculated coefficient collisions component condition consider constant coordinate corresponding cross section crystal curves density density matrix dependence determined distribution dysprosium effective mass elec electric field electron emission energy equation excited experimental expression Exptl Fermi surface ferromagnetic formula frequency Green's function Hamiltonian impurity increase instability integral interaction investigated JETP editor kinetic laser lattice linear magnetic field matrix maximons measured mesons metal method momentum nonlinear nucleons observed obtain operator oscillations parameters particles perturbation perturbation theory phase phonons plane plasma polarization potential quantities quantum radiation region resonance sample scattering shown solution Soviet Phys spectra spectrum spin waves Submitted to JETP superconductors symmetry temperature tensor terbium Theoret theory tion transition transverse values vector velocity wave function wave vector width zero