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Mechanical properties of multiferroic Bi 2 Mn 4 O 10 : Full set of elastic constants determined by inelastic neutron scattering
Author(s) -
Ziegler Fabian,
Murshed Mohammad M.,
Gibhardt Holger,
Sobolev Oleg,
Gesing Thorsten M.,
Eckold Götz
Publication year - 2016
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201552670
Subject(s) - resonant ultrasound spectroscopy , phonon , condensed matter physics , inelastic neutron scattering , multiferroics , anisotropy , materials science , neutron diffraction , soft modes , magnetization , physics , neutron scattering , scattering , optics , diffraction , ferroelectricity , elastic modulus , quantum mechanics , dielectric , optoelectronics , magnetic field , composite material
The full matrix of elastic constants of multiferroic Bi 2 Mn 4 O 10 has been determined at ambient conditions using phonon spectroscopy. The dispersion of acoustic phonons in a single crystal was measured at the three axes neutron spectrometer PUMA@FRM II for different propagation directions. The magnitudes of the independent nine elastic constants show that the mechanical behavior is strongly anisotropic with a soft direction which almost coincides with the magnetization vector in the low‐temperature multiferroic phase. The anisotropy can be related to the different types of links between the building blocks of the mullite structure. Three dimensional representation of the sound velocities (in m s −1 ) for a transverse acoustic phonon‐mode.