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New Magnetic Excitations in the Spin-Density-Wave of Chromium

H. Hiraka, P. Boni, Y. Endoh, M. Fujita, K. Yamada, G. Shirane

cond-mat.str-elarXiv:cond-mat/0208084

Abstract

Low-energy magnetic excitations of chromium have been reinvestigated with a single-Q crystal using neutron scattering technique. In the transverse spin-density-wave phase a new type of well-defined magnetic excitation is found around (0,0,1) with a weak dispersion perpendicular to the wavevector of the incommensurate structure. The magnetic excitation has an energy gap of E ~ 4 meV and at (0,0,1) exactly corresponds to the Fincher mode previously studied only along the incommensurate wavevector.

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