Abstract
Structural and magnetic measurements were done on polycrystalline manganite, Pr0.5Eu0.5MnO3. The Rietveld refinement of the x-ray powder diffraction pattern at room temperature suggests considerable Jahn-Teller distortion due to ionic size mismatch of the isovalent ions. Dc and ac magnetometry suggest a disordered antiferromagnetic (AFM) state, exhibiting glassy magnetic behavior at low temperature. Cooling in a static magnetic field reveals a considerable shift of the magnetic hysteresis loops, a typical manifestation of exchange bias. Interestingly, we observe the absence of training effect in exchange bias. The temperature, cooling field dependent study of exchange bias, and absence of exchange bias in La0.5Eu0.5MnO3 suggest a novel low temperature phase separation between a disordered AFM phase induced by the Mn moments and another highly anisotropic phase involving ordering related to the rare-earth moments. It appears that this unique magnetic ground state exhibiting exchange bias is a consequence of the structural distortion inherent in the system.
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