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  • Title: Excitations from a Bose-Einstein condensate of magnons in coupled spin ladders.
    Author: Garlea VO, Zheludev A, Masuda T, Manaka H, Regnault LP, Ressouche E, Grenier B, Chung JH, Qiu Y, Habicht K, Kiefer K, Boehm M.
    Journal: Phys Rev Lett; 2007 Apr 20; 98(16):167202. PubMed ID: 17501456.
    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 reference to spin-dimer materials. 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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