Polarization properties and dielectric relaxations were investigated in single crystalline Mn-substituted YFeO3. Thermally stimulated depolarization currents (TSDC) were observed at Tm ≈ 110 K along all three orthorhombic directions but with different magnitudes. These anisotropic behaviors were also observed in temperature dependent dielectric responses. Electric field sweep polarization measurements down to 10 K showed neither hysteresis nor remanent polarization. Based on the result of the temperature- and frequency-dependent dielectric measurements and the relaxation analysis of the TSDC, we suggest that previously reported pyroelectric currents at ∼110 K are not due to a ferroelectric phase transition but due to the formation of frozen defect dipoles which are induced by the localized charge carriers.
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