Excitations from a Bose-Einstein condensate of magnons in coupled spin ladders

Details Excitations from a Bose-Einstein condensate of magnons in coupled spin ladders Excitations from a Bose-Einstein condensate of magnons in coupled spin ladders

2006-08-25

arxiv.org/abs/cond-mat/0608566v3

Phys. Rev. Lett. 98, 167202 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

The weakly coupled quasi-one-dimensional spin ladder compound (CH$_3$)$_2$CHNH$_3$CuCl$_3$ is studied by neutron scattering in magnetic fields exceeding the critical field of Bose-Einstein condensation of magnons. Commensurate long-range order and the associated Goldstone mode are detected and found to be similar to those in a reference 3D quantum magnet. However, for the upper two massive magnon branches the observed behavior is totally different, culminating in a drastic collapse of excitation bandwidth beyond the transition point.

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