Magnetism in Geometrically Frustrated ${\mathrm{YMnO}}_{3}$ under Hydrostatic Pressure Studied with Muon Spin Relaxation

Magnetism in Geometrically Frustrated ${YMnO}_{3}$ under Hydrostatic Pressure Studied with Muon Spin Relaxation

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, and F. L. Pratt

Phys. Rev. Lett. 98, 197203 – Published 9 May 2007

Abstract

The ferroelectromagnet ${YMnO}_{3}$ consists of weakly coupled triangular layers of $S = 2$ spins. Below $T_{N} \approx 70 K$ muon-spin relaxation data show two oscillatory relaxing signals due to magnetic order, with no purely relaxing signals resolvable (which would require 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.

Received 17 October 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.197203

Authors & Affiliations

T. Lancaster^1,*, S. J. Blundell¹, D. Andreica^2,†, M. Janoschek^3,4, B. Roessli⁴, S. N. Gvasaliya⁴, K. Conder⁵, E. Pomjakushina^4,5, M. L. Brooks¹, P. J. Baker¹, D. Prabhakaran¹, W. Hayes¹, and F. L. Pratt⁶

¹Clarendon Laboratory, Department of Physics, Oxford University, Parks Road, Oxford, OX1 3PU, United Kingdom
²Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
³Technische Universität München, Physics Department E21, D-85747 Garching, Germany
⁴Laboratory for Neutron Scattering, ETHZ and Paul Scherrer Institut, CH-5232 Villigen, Switzerland
⁵Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
⁶ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, United Kingdom

^*Electronic address: t.lancaster1@physics.ox.ac.uk
^†On leave from: Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania.

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Vol. 98, Iss. 19 — 11 May 2007

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Physical Review Letters

Magnetism in Geometrically Frustrated YMnO3 under Hydrostatic Pressure Studied with Muon Spin Relaxation

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, and F. L. Pratt

Phys. Rev. Lett. 98, 197203 – Published 9 May 2007

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Magnetism in Geometrically Frustrated ${YMnO}_{3}$ under Hydrostatic Pressure Studied with Muon Spin Relaxation