Magnetism in Geometrically Frustrated YMnO3 Under Hydrostatic Pressure Studied with Implanted Muons
T. Lancaster, S.J. Blundell, D. Andreica, M. Janoschek, B. Roessli,, S.N. Gvasaliya, K. Conder, E. Pomjakushina, M.L. Brooks, P.J. Baker, D., Prabhakaran, W. Hayes, F.L. Pratt
TL;DR
This study investigates how hydrostatic pressure affects the magnetic properties of YMnO3, revealing increased interlayer exchange and frustration despite a decrease in ordered magnetic moments, using muon-spin relaxation techniques.
Contribution
It provides new insights into pressure-induced changes in magnetic order and frustration in YMnO3 through muon-spin relaxation measurements.
Findings
Transition temperature T_N increases with pressure
Ordered magnetic moment decreases under pressure
Pressure enhances interlayer exchange and frustration
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.
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