Magnetic, Thermal, and Optical Properties of Single-Crystalline CoTa2O6 and FeTa2O6 and their Anisotropic Magnetocaloric Effect

Authors

Aaron B. Christian, Aaron T. Schye, K. O. White, J. J. Neumeier

Publication

Journal of Physics: Condensed Matter

Abstract

The magnetic, thermal, and optical properties of single-crystalline CoTa2O6 and FeTa2O6 are reported. Optical dichroism was observed in CoTa2O6. Magnetic susceptibility chi(T) measurements reveal long-range antiferromagnetic order with Neel temperatures [Formula: see text] K and 8.11(5) K, respectively, and anisotropy in chi. The thermal expansion coefficients exhibit significant anisotropy and the influence of the magnetic ions and long-range order. A structural phase transition to orthorhombic occurs below T N for FeTa2O6. Magnetic field H lowers T N with its affect largest when H is directed along either [110] or [1[Formula: see text]0], and smallest when directed along [001]. This leads to an anisotropic magnetocaloric effect that is investigated through measurements of the specific heat and magnetization in applied magnetic field.

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