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Direct observation of double-k lattice modulation in double-k magnetic structures. The case of CeAl2

Stunault, A.; Schweizer, J.; Givord, F.; Vettier, Christian LU ; Detlefs, C.; Boucherle, J-X and Lejay, P. (2009) In Journal of Physics: Condensed Matter1990-01-01+01:00 21(37).
Abstract
Symmetry analysis is combined with x-ray scattering experiments to investigate the lattice modulation associated with the incommensurate magnetic structure in the case of a double-k structure. The expansion of the free energy shows that the components of the magnetic structure with propagation vectors k(1) and k(2) can couple via components of lattice modulations. It is shown that the classical diffraction peaks reflecting a 2k propagation vector, associated with magneto-elastic effects in single-k structures, will coexist with diffraction peaks with propagation vectors k(1) - k(2) or k(1) + k(2). The existence of these latter peaks can be considered as a signature of a double-k magnetic structure. In the case of the double-k modulated... (More)
Symmetry analysis is combined with x-ray scattering experiments to investigate the lattice modulation associated with the incommensurate magnetic structure in the case of a double-k structure. The expansion of the free energy shows that the components of the magnetic structure with propagation vectors k(1) and k(2) can couple via components of lattice modulations. It is shown that the classical diffraction peaks reflecting a 2k propagation vector, associated with magneto-elastic effects in single-k structures, will coexist with diffraction peaks with propagation vectors k(1) - k(2) or k(1) + k(2). The existence of these latter peaks can be considered as a signature of a double-k magnetic structure. In the case of the double-k modulated structure of CeAl2, group theory is applied directly to the study of the charge modulation. An x-ray scattering study of the 2k satellites shows that the lattice displacements of the two Ce sites of the structure are antiparallel to each other, and perpendicular to the direction of the magnetic modulation. We also confirm experimentally the existence of k(1) + k(2) satellites. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics: Condensed Matter1990-01-01+01:00
volume
21
issue
37
publisher
IOP Publishing
external identifiers
  • wos:000269198900031
  • scopus:70349565660
ISSN
1361-648X
DOI
10.1088/0953-8984/21/37/376004
language
English
LU publication?
yes
id
b1696a7f-90dc-49dc-9aed-ca4f176233b4 (old id 1476234)
date added to LUP
2009-09-29 13:19:26
date last changed
2017-01-01 05:22:13
@article{b1696a7f-90dc-49dc-9aed-ca4f176233b4,
  abstract     = {Symmetry analysis is combined with x-ray scattering experiments to investigate the lattice modulation associated with the incommensurate magnetic structure in the case of a double-k structure. The expansion of the free energy shows that the components of the magnetic structure with propagation vectors k(1) and k(2) can couple via components of lattice modulations. It is shown that the classical diffraction peaks reflecting a 2k propagation vector, associated with magneto-elastic effects in single-k structures, will coexist with diffraction peaks with propagation vectors k(1) - k(2) or k(1) + k(2). The existence of these latter peaks can be considered as a signature of a double-k magnetic structure. In the case of the double-k modulated structure of CeAl2, group theory is applied directly to the study of the charge modulation. An x-ray scattering study of the 2k satellites shows that the lattice displacements of the two Ce sites of the structure are antiparallel to each other, and perpendicular to the direction of the magnetic modulation. We also confirm experimentally the existence of k(1) + k(2) satellites.},
  author       = {Stunault, A. and Schweizer, J. and Givord, F. and Vettier, Christian and Detlefs, C. and Boucherle, J-X and Lejay, P.},
  issn         = {1361-648X},
  language     = {eng},
  number       = {37},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics: Condensed Matter1990-01-01+01:00},
  title        = {Direct observation of double-k lattice modulation in double-k magnetic structures. The case of CeAl2},
  url          = {http://dx.doi.org/10.1088/0953-8984/21/37/376004},
  volume       = {21},
  year         = {2009},
}