Abstract
Magnetodielectric properties of the tetragonal magnetic insulator Ba(TiO)Cu4(PO4)4 consisting of asymmetric Cu4O12 square cupolas have been investigated in a magnetic field along the [001] axis (B[001]), where a metamagnetic transition occurs at Bc||[001] ~ 12T and 1.4K. Clear anomalies associated with the transition to the high-field phase are observed in dielectric constants both along the [100] (ε[100]) and [001] (ε[001]) axes. It is found that the B dependence of ε[001] and ε[100] across Bc||[001] is anisotropic: ε[001] decreases while ε[100] increases. The origin of this anisotropic magnetodielectric response is discussed.
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