Field-Induced Linear Magnetoelastic Coupling in Multiferroic TbMnO3

Journal Article · Sun Jan 01 04:00:00 EST 2006 · Phys. Rev. B: Condens. Matter

DOI:https://doi.org/10.1103/PhysRevB.73.020102· OSTI ID:914229

Aliouane, N; Argyriou, D; Strempfer, J; Zegkinoglou, I; Landsgesell, S; von Zimmermann, M

We have used in-field neutron and x-ray single-crystal diffraction to measure the incommensurability {delta} of the crystal and magnetic structures of multiferroic TbMnO{sub 3}. We show that the flop in the electric polarization at the critical field HC, for field H along the a and b axes, coincides with a first-order transition to a commensurate phase with propagation vector {kappa}=(0,1/4,0). In-field x-ray diffraction measurements show that the quadratic magnetoelastic coupling breaks down with applied field as shown by the observation of the first harmonic lattice reflections above and below HC. This indicates that magnetic field induces a linear magnetoelastic coupling.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 914229
• Report Number(s): BNL--78797-2007-JA
• Journal Information: Phys. Rev. B: Condens. Matter, Journal Name: Phys. Rev. B: Condens. Matter Vol. 73
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRITICAL FIELD
HARMONICS
MAGNETIC FIELDS
NEUTRON DIFFRACTION
NEUTRONS
POLARIZATION
TERBIUM ALLOYS
VECTORS
X-RAY DIFFRACTION
national synchrotron light source