Magnetism in Geometrically Frustrated YMnO3 Under Hydrostatic Pressure Studied with Implanted Muons

Abstract

The rare-earth ferroelectromagnet YMnO3 consists of weakly coupled triangular layers of S=2 spins. Below T_N ~ 70 K muon-spin relaxation data show two oscillatory relaxing signals due to magnetic order, with no relaxing signal resolvable (which would be expected for different coexisting spin distributions). The transition temperature T_N increases with applied hydrostatic pressure, even though the ordered moment decreases. These results suggest that pressure increases both the exchange coupling between the layers and the frustration within the layers.

arXiv comment4 pages, 3 figures, v2 (updated figures and minor changes to text)

References in corpus (8)

• Spin-polarized muons in condensed matter physics
• Unconventional spin fluctuations in the hexagonal antiferromagnet YMnO${}_3$
• Spin dynamics and magnetic order in magnetically frustrated Tb2Sn2O7
• Magnets with strong geometric frustration
• Epitaxial Growth of Multiferroic YMnO3 on GaN
• Direct evidence for a dynamical ground state in the highly frustrated Tb${}_2$Sn${}_2$O${}_7$ pyrochlore
• Spin fluctuations in the stacked-triangular antiferromagnet YMnO3
• Reduction of the ordered magnetic moment in YMnO3 with hydrostatic pressure

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