Manifestation of magnetic quantum fluctuations in the dielectric properties of a multiferroic : Natu
(a) Dielectric constant as a function of temperature above the saturation magnetic field. Black triangles point to anomalies in ε that appear above 40 T. Inset shows the expanded ε(T) curve at 45 T, which show a sudden drop of ε below ~6.5 K. Dotted line ...