Excitations from a Bose-Einstein condensate of magnons in coupled spin ladders
V. O. Garlea, A. Zheludev, T. Masuda, L. -P. regnault, E. Ressouche, B. Brenier, H. Manaka, J. -H. Chung, Y. Qiu, K. Habicht, K. Kiefer, M. Boehm
Abstract
The weakly coupled quasi-one-dimensional spin ladder compound (CH3)2CHNH3CuCl3 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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