Abstract
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YFeO3 single crystal displays two relaxor-like dielectric relaxations, one at low temperature
(170300 K) and one at high temperature (370520 K), which are attributed to the activation of
electrons and oxygen vacancies, respectively. Above the temperature at which electrons are
activated, the sample displays a large magnetocapacitance effect. Comparison of the impedance
Cole-Cole plots measured with and without applied magnetic field reveals that the occurrence of
magnetocapacitance effect is accompanied with an increasing in DC conductivity under magnetic
field after the activation of electrons, which is explained by the enhancement of electron jumping
in Fe2þ-O-Fe3þ chains by magnetic field. Thus the magnetocapacitance effect in YFeO3 single
crystal can be explained by the combination of the Maxwell-Wagner space charge effect and/or
magnetoresistance effect, depending on the frequency range.