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Neutron scattering measurement of spin-wave dispersion in Rb 2 CrCl 4 : a two-dimensional easy-plane ferromagnet

1976; IOP Publishing; Volume: 9; Issue: 3 Linguagem: Inglês

10.1088/0022-3719/9/3/001

1747-3802

M. T. Hutchings, M J Fair, Peter Day, Peter Walker,

Advanced NMR Techniques and Applications

The spin-wave dispersion relations for Rb2CrCl4, which orders ferromagnetically at 63K have been measured at 4.5K. The spin-wave energies confirm the two-dimensional nature of the interactions; writing H12=-2J12S1.S2 they can be fitted by a single exchange parameter J1=0.66+or-0.01 meV (7.7+or-0.1K) representing the interaction between nearest-neighbour in-plane ions. Rb2CrCl4 should therefore typify a two-dimensional, S=2, easy-plane ferromagnet.