Magnon Bose condensation in symmetry breaking magnetic field

Details Magnon Bose condensation in symmetry breaking magnetic field Magnon Bose condensation in symmetry breaking magnetic field

2006-07-27

arxiv.org/abs/cond-mat/0607711v2

J. Phys.: Condens. Matter 19 (2007) 145208

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted to J. of Phys. Condens. Matter (Proceedings of International Conference "Highly Frustrated Magnets", Osaka (Japan),

Scientific paper

10.1088/0953-8984/19/14/145208

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 family$R_2Cu O_4$ 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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