## Soviet Physics: JETP. |

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absorption amplitude angle anisotropy antiferromagnetic approximation assume atoms axis behavior calculated coefficient collisions component condition consider constant corresponding cross section crystal curve cyclotron decrease deformation density dependence determined effect Eksp electric field electron energy equations excitons experimental expression Fermi Fermi surface ferromagnetic fluctuations flux follows formula frequency Green's function Hamiltonian helium hydrogen increase integral interaction investigated ionization ions JETP lattice linear load jumps magnetic breakdown magnetic field matrix molecule motion niobium nuclei observed obtained oscillations PACS numbers parameter particles permittivity perturbations phase transition phonon Phys plane plasma polarization possible potential present paper problem pulse quantity quasiparticles region relaxation resonance result ruthenium samples scattering shock wave solitons solution spin structure superconducting surface symmetry temperature tensor Teor theory thermal conductivity tion trajectories transformation values variables vector velocity width zero