Magnon Bose condensation in symmetry breaking magnetic field
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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