Critical slowing down in the geometrically frustrated pyrochlore antiferromagnet Gd_2Ti_2O_7

Details Critical slowing down in the geometrically frustrated pyrochlore antiferromagnet Gd_2Ti_2O_7 Critical slowing down in the geometrically frustrated pyrochlore antiferromagnet Gd_2Ti_2O_7

2005-08-30

arxiv.org/abs/cond-mat/0508738v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures, submitted to 10th International Conference on Muon Spin Rotation, Relaxation, and Resonance, Oxford, UK, A

Scientific paper

10.1016/j.physb.2005.11.036

Longitudinal-field muon spin relaxation experiments have been carried out in the paramagnetic state of single-crystal Gd_2Ti_2O_7 just above the phase transition at T_m = 1.0 K. At high applied fields the exponential relaxation time T_1 is proportional to field, whereas T_1 saturates below a crossover field B_c that is ~2.5 T at 1.5 K and decreases as T_m is approached. At low fields the relaxation rate increases markedly as the freezing temperature is approached, as expected for critical slowing down of the spin fluctuations, but the increase is suppressed by applied field. This behavior is consistent with the very long autocorrelation function cutoff time implied by the low value of B_c.

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