Dynamic susceptibility of a spin ice near the critical point

Details Dynamic susceptibility of a spin ice near the critical point Dynamic susceptibility of a spin ice near the critical point

2010-11-16

arxiv.org/abs/1011.3659v2

Pis'ma v ZhETF 92, 884 (2010)

Physics

Condensed Matter

Other Condensed Matter

5 pages, 3 figures. Some misprints are corrected, among them are the formula (20) and the estimation for $\Gamma_c$

Scientific paper

We consider spin ice magnets (primarily, $\mathrm{Dy_2Ti_2O_7}$) in the vicinity of their critical point on the $(H,T)$ plane. We find that the longitudinal susceptibility diverges at the critical point, leading to the behaviour qualitatively similar to the one which would result from non-zero conductance of magnetic charges. We show that dynamics of critical fluctuations belongs to the universality class of easy-axis ferroelectric and calculate logarithmic corrections (within two-loop approximation) to the mean-field critical behavior.

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