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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2004     Display Documents

ID: 192931.0, MPI für Festkörperforschung / FKF Publikationen 2004
Neutron diffraction study of the magnetic structures of one-dimensional M2TbF6 (M = Li, K, Rb) fluorides: frustration, incommensurability and magnetic interactions
Authors:Josse, M.; Dubois, M.; El-Ghozzi, M.; Avignant, D.; André, G.; Bourée, F.; Guillot, M.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Journal of Alloys and Compounds
Issue / Number:1-2
Start Page:207
End Page:212
Review Status:not specified
Audience:Not Specified
Abstract / Description:The three title compounds crystallize in the monoclinic system, with
unit cell parameters (at 4.95 K): Li2TbF6: a = 7.5643(3) Angstrom, b =
4.9372(3) Angstrom, c = 11.0710(4) Angstrom, beta = 107.012(3)degrees,
space group P2(1)/c (ndegrees 14), K2TbF6: a = 6.5909(2) Angstrom, b =
11.4135(4) Angstrom, c = 7.1235(2) Angstrom, beta = 90.502(2)degrees,
space group C2/c (ndegrees 15), and Rb2TbF6: a = 6.8298(2) Angstrom, b
= 11.8385(5) Angstrom, c = 7.2013(2) Angstrom, beta = 91.358(2)degrees,
space group C2/c (ndegrees 15). Neutron diffraction study down to 1.4 K
revealed an antiferromagnetic ordering for the three compounds,
occurring at T-N = 2.02(1), 1.60(5) and 2.10(5) K for Li, K and Rb
representatives, respectively. All the magnetic structures are
incommensurate and square-modulated with extremely long periods at 1.40
K. While the magnetic structure of Li2TbF6 is characterized by a
propagation vector k = (0, 0.01617(7), 0), those of the potassium and
rubidium representatives exhibit propagation vectors k = (0.0073(2), 0,
0) and k = (0.01039(8), 0, 0), respectively, these three propagation
vectors corresponding to the direction of the shortest interchain
distances. This singular magnetic behaviour will be correlated with the
nuclear structures and the potential competition between magnetic
interactions occurring in these M2TbF6 compounds and will be discussed
in the light of a fine topological analysis. (C) 2003 Elsevier B.V. All
rights reserved.
Free Keywords:magnetically ordered materials; chemical synthesis; neutron scattering;
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:Univ Clermont Ferrand, CNRS, UMR 6002, Lab Mat Inorgan, F-63177 Aubiere, France.
; CEA Saclay, CNRS, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France.
; CNRS, MPI, High Field Magnet Lab, F-38042 Grenoble, France.
Identifiers:ISI:000222169600049 [ID No:1]
ISSN:0925-8388 [ID No:2]
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