Magnetic and ferroelectric response of Ca2TiMnO6 manganite-like perovskite
REVISTA MEXICANA DE FISICA(2012)
摘要
The synthesis and characterization of the new manganite-like material Ca2TiMnO6 are reported. The samples were produced by the solid-state reaction recipe. X-ray diffraction experiments and Rietveld refinement reveal that material crystallizes in a tetragonal complex perovskite (space group I4/m, number 87) with lattice parameters alpha=5.5858 angstrom and c=7.7518 angstrom. The magnetic properties were studied by a Quantum Design MPMS SQUID. From measurements of magnetization as a function of temperature, we determine the occurrence of a paramagnetic-antiferromagnetic transition with Neel temperature T-N=15.5 K. A Curie-Weiss fitting permitted to obtain the magnetic characteristic parameters. Curves of magnetization as a function of applied field show the magnetic hysteresis which is characteristic of magnetically ordered systems. Curves of electric polarization, including the application of voltages up to 560 V, evidence the ferroelectric character of material at room temperature.
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关键词
New materials,complex perovskite,multiferroic
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