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

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arxiv cond-mat/0608566 v3 pith:GEEATQWK submitted 2006-08-25 cond-mat.str-el cond-mat.supr-con

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
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Y. Qiu K. Habicht K. Kiefer M. Boehm
This is my paper
classification cond-mat.str-el cond-mat.supr-con
keywords bose-einsteincoupledmagnonsspinassociatedbandwidthbehaviorbeyond
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abstract

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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