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Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6
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Image of FIG. 1.
FIG. 1.

The crystal structure of YCoMnO. Co (blue) and Mn (light green) ions are surrounded by oxygen polyhedra. Y and O are represented as light cyan and red spheres, respectively. The Co-Mn-Co-Mn chains along c-axis form ↑↑-↓↓ spin arrangement.

Image of FIG. 2.
FIG. 2.

(a) Room temperature X-ray powder diffraction pattern of YCoMnO and the Rietveld refinement profile. Observed (o), calculated (red line), background (green line), difference (blue line) are shown along with Bragg position (|). Monoclinic crystal structure in space group P2/n is confirmed. (b) Neutron diffraction pattern at 300 K. Inset compares neutron data at 2.7 K (blue line) and 300 K (black line). A peak at 17.345° relates to antiferromagnetic ordering that is not allowed under P2/n symmetry.

Image of FIG. 3.
FIG. 3.

Magnetization versus temperature at 0.005 T (*) and 0.01 T (o) measured under FC and ZFC protocol. Inset (a) shows χ versus temperature with Curie-Weiss fitting. Inset (b) shows ac susceptibility measurement at 7, 77, and 777 Hz. Frequency dependent behaviour is observed below transition temperature.

Image of FIG. 4.
FIG. 4.

Electrical polarization is plotted as function of temperature in the presence of 0 and 5 T external field (poling field = 1.5 kV/cm). Inset (a) shows measured pyroelectric current as a function of temperature. Inset (b) shows polarization as a function of temperature for different poling fields (1.5, 1.2, 0.8, 0.4, −0.4, −0.8, −1.2, −1.5 kV/cm). Polarization reversal under negative poling field is confirmed. Inset (c) shows change in pyroelectric current direction as a function of time when temperature is cycled over ±1 K. This confirms genuine ferroelectricity in the compound.


Generic image for table
Table I.

Structural parameters of YCoMnO.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetism driven ferroelectricity above liquid nitrogen temperature in Y2CoMnO6