A Stunault et al 2009 J. Phys.: Condens. Matter 21 376004 doi:10.1088/0953-8984/21/37/376004
Direct observation of double-k lattice modulation in double-k magnetic structures. The case of CeAl2
A Stunault1,6, J Schweizer2, F Givord2, C Vettier3,4, C Detlefs3, J-X Boucherle2 and P Lejay5
Show affiliationsSymmetry 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 k1 and k2 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 k1−k2 or k1+k2. 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 k1+k2 satellites.
- PACS
-
75.80.+q Magnetomechanical and magnetoelectric effects, magnetostriction
- Subjects
- Dates
-
Issue 37 (16 September 2009)
Received 2 June 2009, in final form 31 July 2009
Published 21 August 2009
-
Direct observation of double-k lattice modulation in double-k magnetic structures. The case of CeAl2
A Stunault et al 2009 J. Phys.: Condens. Matter 21 376004
-
Full counting statistics for noninteracting fermions: joint probability distributions
L Inhester and K Schönhammer 2009 J. Phys.: Condens. Matter 21 474209
-
Structure determination of Bi/Ge(111)-
by dynamical low-energy electron diffraction analysis and scanning tunneling microscopy
Yoshiyuki Ohtsubo et al 2009 J. Phys.: Condens. Matter 21 405001
-
Micro-fluidic channel fabrication via two-photon absorption (TPA) polymerization assisted ablation
S Jariwala et al 2009 J. Micromech. Microeng. 19 115023
-
Characteristic crossing point (T*≈2.7 K) in specific heat curves of samples RuSr2Gd1.5Ce0.5Cu2O10−δ taken for different values of magnetic field
B I Belevtsev et al 2009 J. Phys.: Condens. Matter 21 455602
-
Dynamics of vacillating voters
R Lambiotte and S Redner J. Stat. Mech. (2007) L10001
-
Universal distribution of random matrix eigenvalues near the 'birth of a cut' transition
B Eynard J. Stat. Mech. (2006) P07005
-
Crowding at the front of marathon packs
Sanjib Sabhapandit et al J. Stat. Mech. (2008) L03001
-
Fluctuation theorems for stochastic dynamics
R J Harris and G M Schütz J. Stat. Mech. (2007) P07020
-
The cavity method for large deviations
Olivier Rivoire J. Stat. Mech. (2005) P07004
Users also read
What's this?- Imaging scarred states in quantum dots
- Domain boundary formation in helical multishell gold nanowires
- Superconductivity up to 29 K in SrFe2As2 and BaFe2As2 at high pressures