Ordering and Excitations in the Field-Induced Magnetic Phase of Cs_3Cr_2Br_9

Details Ordering and Excitations in the Field-Induced Magnetic Phase of Cs_3Cr_2Br_9 Ordering and Excitations in the Field-Induced Magnetic Phase of Cs_3Cr_2Br_9

2004-03-08

arxiv.org/abs/cond-mat/0403215v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.92.177202

Field-induced magnetic order has been investigated in detail in the interacting spin 3/2 dimer system Cs_3Cr_2Br_9. Elastic and inelastic neutron scattering measurements were performed up to H = 6 T, well above the critical field H_c1 = 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 H_c1, the gap increases slowly with field. An analysis in terms of projected pseudo-spin is given.

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