Possible mechanism of emergence of significant spontaneous electric polarization in orthoferrite HoFeO3.
We propose to investigate occurrence of polar order in HoFeO3 single. High quality of HoFeO3 single crystal is cut along three crystallographic directions. Our careful pyroelectric measurement reveals an evident signature of a peak in the pyroelectric current below the spin reorientation transitions along [101] and [001] directions. Thermal variations of spontaneous electric polarization along [010 and [001] shows that polar ferroelectric order appears below the spin reorientation transition. We could not convincingly detect polar order along [100] direction. We note that the magnitude of electric polarization is 9.2 and 12.4 µC/cm2 along [010] and [001] directions, respectively which is significantly higher than the previous reports in RFeO3 (R=Sm, Gd, and Dy). To understand the microscopic origin of the ferroelectric polarization in HoFeO3 we propose to perform single crystal neutron diffraction studies as a function of temperature from 100 K down to 2 K (well below spin reorientation transition temperature) at zero and applied magnetic field and also as a function of magnetic field up to 5 T. We request 10 days of neutron beam time on D10 for the proposed experiment.
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CHATTERJI Tapan; DHIMAN indu; GIRI Saurav and OULADDIAF Bachir. (2015). Possible mechanism of emergence of significant spontaneous electric polarization in orthoferrite HoFeO3.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-801
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