Magnetic properties of hexagonal YMnO₃, LuMnO₃ and ScMnO₃ Magnetic susceptibility, specific heat and dielectric constant of hexagonal YMnO₃, LuMnO₃ and ScMnO₃
Tomuta, D. G. · Ramakrishnan, S. · Nieuwenhuys, G. J. · Mydosh, J. A.
Original · EN
We report the magnetic susceptibility, specific heat and dielectric constant on high purity polycrystalline samples of three hexagonal manganites: YMnO₃, LuMnO₃ and ScMnO₃. These materials can exhibit a ferroelectric transition at very high temperatures (TFE > 700K). At lower temperatures there is magnetic ordering of the frustrated Mn³⁺ spins (S=2) on a triangular Mn lattice (YMnO₃:Tₙ=71K; LuMnO₃:Tₙ=90K and ScMnO₃:Tₙ=130K). The transition is characterized by a sharp kink in the magnetic susceptibility at Tₙ below which it continues to increase due to the frustration on the triangular lattice. The specific heat shows one clear continuous phase transition at Tₙ, which is independent of external magnetic field up to 9T with an entropy content as expected for Mn³⁺ ions. The temperature dependent dielectric constant displays a distinct anomaly at Tₙ.
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