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Structural and magnetic transitions in BaMnF/sub 4 [electronic resource].

Published
Washington, D.C : United States. Energy Research and Development Administration, 1976.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 7 : digital, PDF file
Additional Creators
United States. Energy Research and Development Administration and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Neutron scattering studies have been undertaken to probe the structural and magnetic transitions in BaMnF/sub 4/ occurring at T/sub c/ = 247 +- 0.5K and T/sub N/ approximately 26K respectively. Below T/sub c/ superlattice reflections are observed at incommensurate positions along the (zeta/sup 1///sub 2//sup 1///sub 2/) and (zeta00) directions of the base centered orthorhombic (A2/sub 1/am) Brillouin zone. The new reflections appear at q/sub 1/ = (+-0.392, +-0.5, +-0.5), q/sub 2/ = (+-0.216, 0, 0) and q/sub 3/ = 3(+-0.176, +-0.5, +-0.5) which bear the relationship q/sub 2/ = 2q/sub 1/ and q/sub 3/ = 3q/sub 1/. Above T/sub c/ critical scattering is observed only at the q/sub 1/ positions implying the existence of a primary order parameter with the wave vector Q/sub 1/ and either harmonics or secondary distortions with wave vectors q/sub 2/ and q/sub 3/. Below T/sub N/ magnetic superlattice peaks (q/sub 0//sup M/) were observed characteristic of the antiferromagnetic structure of the isostructural compounds BaNiF/sub 4/ and BaFeF/sub 4/. Two sets of satellite peaks q/sub 1//sup M/ and q/sub 2//sup M/ analogous to the nuclear satellites were also found. The magnon dispersion curves were measured and near neighbor exchange constants determined.
Report Numbers
E 1.99:bnl-21475
E 1.99: conf-760601-4
conf-760601-4
bnl-21475
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Note
Published through SciTech Connect.
01/01/1976.
"bnl-21475"
" conf-760601-4"
Conference on neutron scattering, Gatlinburg, TN, USA, 6 Jun 1976.
Eibschutz, M; Cowley, R A; Shapiro, S M; Cox, D E; Guggenheim, H J.
Brookhaven National Lab., Upton, N.Y. (USA)
Bell Labs., Murray Hill, N.J. (USA)
Funding Information
E(30-1)-16
View MARC record | catkey: 14065546