Magnon Bose condensation in symmetry breaking magnetic field
S. V. Maleyev, V. P. Plakhty, S. V. Grigoriev, A. I. Okorokov, A. V. Syromyatnikov
Abstract
Magnon Bose condensation (BC)in the symmetry breaking magnetic field is a result of unusual form of the Zeeman energy, which has terms linear in the spin-wave operators and terms mixing excitations differ in the Wave-vector of the magnetic structure. The following examples are considered: simple easy-plane tetragonal antiferromagnets (AF), frustrated AF familyR2Cu O4 where R=Pr,Nd etc. and cubic magnets with the Dzyaloshinskii-Moriya interaction (Mn Si etc.). In all cases the BC becomes important when the magnetic field becomes comparable with the spin-wave gap. The theory is illustrated by existing experimental results.
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