Spin fluctuations in the stacked-triangular antiferromagnet YMnO3

Abstract

The spectrum of spin fluctuations in the stacked-triangular antiferromagnet YMnO3 was studied above the Neel temperature using both unpolarized and polarized inelastic neutron scattering. We find an in-plane and an out-of-plane excitation. The in-plane mode has two components just above TN, a resolution-limited central peak and a Debye-like contribution. The quasi-elastic fluctuations have a line-width that increases with q like Dq^z and the dynamical exponent z=2.3. The out-of-plane fluctuations have a gap at the magnetic zone center and do not show any appreciable q-dependence at small wave-vectors.

JETP LETTERS, in press

References in corpus (5)

• Universality of phase transitions of frustrated antiferromagnets
• Magnetodielectric Effects from Spin Fluctuations in Isostructural Ferromagnetic and Antiferromagnetic Systems
• Triangular Antiferromagnets
• Unconventional spin fluctuations in the hexagonal antiferromagnet YMnO${}_3$
• Spin-dynamics simulations of the triangular antiferromagnetic XY model

Cited by in corpus (10)

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• Magnetic excitations in multiferroic LuMnO3 studied by inelastic neutron scattering
• Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO${}_3$
• Magnetism in Geometrically Frustrated YMnO3 Under Hydrostatic Pressure Studied with Implanted Muons
• Terahertz and infrared spectroscopic evidence of phonon-paramagnon coupling in hexagonal piezomagnetic YMnO3
• Local control of improper ferroelectric domains in YMnO${}_3$
• Classical spin liquid or extended critical range in h-YMnO${}_3$?
• Characterizing the diffuse continuum excitations in the classical spin liquid $h$-YMnO${}_3$
• Strain Fields and Critical Phenomena in Manganites II: Spin-Lattice-Energy Hamiltonians