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VOLUME 52 (1990) | ISSUE 11 | PAGE 1179
Anomalies in the quantum excitation spectrum of a magnetic material with a strong quasiparticle interaction
It is shown in a nonlinear theory that the quantum spectrum of excitations becomes analogous to the spectrum of excitations of a quantum Bose liquid in the case of a highly anisotropic ferromagnet, with a large number of interacting quasiparticles.