Er2Ti2O7: Evidence of quantum order by disorder in a frustrated antiferromagnet
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). ISSN 1098-0121Full text not available from this repository.
Official URL: http://dx.doi.org/10.1103/PhysRevB.68.020401
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|
|Subjects:||Q Science > QC Physics|
|Divisions:||Faculty of Science > Physics|
|Journal or Publication Title:||Physical Review B (Condensed Matter and Materials Physics)|
|Publisher:||American Physical Society|
|Number of Pages:||4|
|Access rights to Published version:||Open Access|
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