Field-induced magnetic and structural domain alignment in PrO2

Gardiner, C.H., Boothroyd, A.T., McKelvy, M.J., McIntyre, G.J. and Prokes, K. (2004) Field-induced magnetic and structural domain alignment in PrO2. Physical Review B, 70(2), 024416. (doi:10.1103/PhysRevB.70.024416)

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Abstract

We present a neutron diffraction study of the magnetic structure of single crystal PrO 2 under applied fields of 0 – 6 T . As the field is increased, changes are observed in the magnetic Bragg intensities. These changes are found to be irreversible when the field is reduced, but the original intensities can be recovered by heating to T > 122 K , then recooling in zero field. The antiferromagnetic ordering temperature T N = 13.5 K and the magnetic periodicity are unaffected by the applied field. We also report measurements of the magnetic susceptibility of single crystal PrO 2 under applied fields of 0 – 7 T . These show strong anisotropy, as well as an anomaly at T = 122 ± 2 K , which coincides with the temperature T D = 120 ± 2 K , at which a structural distortion occurs. For fields applied along the [100] direction the susceptibility increases irreversibly with field in the temperature range T N < T < T D . However, for fields along [110] the susceptibility is independent of field in this range. We propose structural domain alignment, which strongly influences the formation of magnetic domains below T N , as the mechanism behind these changes.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Webster, Dr Carol
Authors: Gardiner, C.H., Boothroyd, A.T., McKelvy, M.J., McIntyre, G.J., and Prokes, K.
College/School:College of Science and Engineering > School of Computing Science
Journal Name:Physical Review B
Publisher:American Physical Society
ISSN:1098-0121
ISSN (Online):1550-235X
Published Online:27 July 2004

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