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Phys. Rev. Lett. 98, 197203 (2007) [4 pages]

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

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T. Lancaster1,*, S. J. Blundell1, D. Andreica2,†, M. Janoschek3,4, B. Roessli4, S. N. Gvasaliya4, K. Conder5, E. Pomjakushina4,5, 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

Received 17 October 2006; published 9 May 2007

The ferroelectromagnet YMnO3 consists of weakly coupled triangular layers of S=2 spins. Below TN≈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 TN 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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.197203
DOI:
10.1103/PhysRevLett.98.197203
PACS:
75.25.+z, 75.40.Cx, 75.50.Ee, 76.75.+i

*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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