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Er2Ti2O7: Evidence of quantum order by disorder in a frustrated antiferromagnet
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Champion, J. D. M., Harris, M. J., Holdsworth, P. C. W., Wills, A. S., Balakrishnan, Geetha, Bramwell, S. T., Čižmár, E., Fennell, T., Gardner, J. S., Lago, J., McMorrow, D. F., Orendáč, M., Orendáčová, A., Paul, Don McK., Smith, R. I., Telling, M. T. F. and Wildes, A. (2003) Er2Ti2O7: Evidence of quantum order by disorder in a frustrated antiferromagnet. Physical Review B (Condensed Matter and Materials Physics), 68 (2). doi:10.1103/PhysRevB.68.020401 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.68.020401
Abstract
Er2Ti2O7 has been suggested to be a realization of the frustrated <111> XY pyrochlore lattice antiferromagnet, for which theory predicts fluctuation-induced symmetry breaking in a highly degenerate ground state manifold. We present a theoretical analysis of the classical model compared to neutron scattering experiments on the real material, both below and above T-N=1.173(2) K. The model correctly predicts the ordered magnetic structure, suggesting that the real system has order stabilized by zero-point quantum fluctuations that can be modeled by classical spin wave theory. However, the model fails to describe the excitations of the system, which show unusual features.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1098-0121 | ||||
Official Date: | 2003 | ||||
Dates: |
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Volume: | 68 | ||||
Number: | 2 | ||||
Number of Pages: | 4 | ||||
DOI: | 10.1103/PhysRevB.68.020401 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) |
Data sourced from Thomson Reuters' Web of Knowledge
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