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Phys. Rev. B 72, 224411 (2005) [12 pages]

Neutron scattering studies of the spin ices Ho2Ti2O7 and Dy2Ti2O7 in applied magnetic field

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T. Fennell*
The Royal Institution of Great Britain, 21 Albemarle Street, London W1S 4BS, United Kingdom

O. A. Petrenko† and B. Fåk‡
ISIS Facility, Rutherford-Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom

J. S. Gardner
Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA and NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562, USA

S. T. Bramwell§
Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom

B. Ouladdiaf
Institut Laue-Langevin, 6 rue Jules Horowitz, BP 156-38042, Grenoble, Cedex 9, France

Received 7 March 2005; revised 30 August 2005; published 9 December 2005

Neutron diffraction has been used to investigate the magnetic correlations in single crystals of the spin ice materials Ho2Ti2O7 and Dy2Ti2O7 in an external magnetic field applied along either the [001] or [11̅ 0] crystallographic directions. With the field applied along [001] a long range ordered ground state is selected from the spin ice manifold. With the field applied along [11̅ 0] the spin system is separated into parallel (α) and perpendicular (β) chains with respect to the field. This leads to partial ordering and the appearance of quasi-one-dimensional magnetic structures. In both field orientations this frustrated spin system is defined by the appearance of metastable states, magnetization plateaus and unusually slow, field regulated dynamics.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.224411
DOI:
10.1103/PhysRevB.72.224411
PACS:
75.25.+z, 75.40.Cx, 75.50.−y, 75.60.Ej

*Present address: ESRF, 6 Rue Jules Horowitz, BP 220, 38043 Grenoble Cedex 9, France.

†Present address: Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.

‡Permanent address: CEA Grenoble, DRFMC/SPSMS, 38054, Grenoble Cedex, France.

§Electronic address: s.t.bramwell@ucl.ac.uk

 
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