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Abstract
The change in the soft-mode frequency in single-crystal KTa03 with magnetic field was measured at 20.1K via dielectric measurements using the Lyddane-Sachs-Teller relation. At 10T, the change in the soft-mode frequency is ∼-0.2%. Converted to shifts in the Curie temperature with magnetic field, the data indicate that T0(H)-T0(0) ∼ 5 × 10-4 H2 + 7.5 × 10-6 H4 (H in Tesla). These data are consistent with recent neutron measurements on SrTiO3 and dielectric measurements on BaTiO3