Incommensurate spin density wave in metallic V_(2-y)O_3

Creators: Bao, Wei; Broholm, C.; Carter, S. A.; Rosenbaum, T. F.; Aeppli, G.; Trevino, S. F.; Metcalf, P.; Honig, J. M.; Spalek, J.

Abstract

We show by neutron diffraction that metallic V_(2-y)O_3 develops a spin density wave below T_N≊9 K with incommensurate wave vector q≊1.7c* and an ordered moment of 0.15μ_B. The weak ordering phenomenon is accompanied by strong, nonresonant spin fluctuations with a velocity c = 67(4) meV Å. The spin correlations of the metal are very different from those of the insulator and place V_(2-y)O_3 in a distinct class of Mott-Hubbard systems where the wave vector for magnetic order in the metal is far from a high symmetry commensurate reciprocal lattice point.

Additional Information

© 1993 The American Physical Society. Received 3 May 1993. It is a pleasure to thank R. W. Erwin, J. W. Lynn, J. M. Rowe, and J. J. Rush for ideas and encouragement. C.B. thanks the Aspen Center for Physics where some of this work was performed. The work at The University of Chicago was supported by NSF DMR 92-04820. J.M.H. and J.S. were supported on MISCON Grant No. DE-FG02-90ER45427.

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