科研之友
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摘要
A series of polycrystalline orthorhombic manganites Sm1-xLuxMnO3 have been synthesized in order to study the magnetism-induced ferroelectricity. Detailed measurements of the magnetic and electric properties of Sm1-xLuxMnO3 (0 <= x <= 0.3) compounds have been performed. The obtained Mn-O-Mn bond angle and the Neel temperature decrease with increasing x, indicating the strengthened frustration of original A-type antiferromagnetic (A-AFM) order of Mn spins. For lower x concentrations, no ferroelectricity is detected, implying the stability of the A-AFM ordering. Further increasing x, a dielectric anomaly begins to develop at 28K since x = 0.15 which is not observed in SmMnO3. Coinciding with this dielectric anomaly, a ferroelectric polarization emerges, implying the multiferroicity. For intermediate compositions, a possible complex phase separation exists.
