Ordering and Excitations in the Field-Induced Magnetic Phase of Cs3Cr2Br9
Abstract
Field-induced magnetic order has been investigated in detail in the interacting spin 3/2 dimer system Cs3Cr2Br9. Elastic and inelastic neutron scattering measurements were performed up to H = 6 T, well above the critical field Hc1 = 1.5 T. The ordering displays incommensurabilities and a large hysteresis before a commensurate structure is reached. This structure is fully determined. Surprisingly, the lowest excitation branch never closes. Above Hc1, the gap increases slowly with field. An analysis in terms of projected pseudo-spin is given.
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