Issue 16, 2015

Atypical multiferroicity of HoCrO3 in bulk and film geometry

Abstract

We report ferroelectricity in antiferromagnetic HoCrO3 with a reasonably large value of spontaneous electric polarization (∼0.32 μC cm−2 at 10 K) from the measurement of pyroelectric current. The appearance of ferroelectricity is further confirmed in the film geometry. Intriguingly, the onset of polar order is observed at a significantly higher temperature (∼240 K) than the Néel temperature (TN = 142 K). The survival of remanent polarization is confirmed from the electric polarization hysteresis loops above and below TN for polycrystalline and film specimens. Structural analysis suggests that polar oxygen octahedral rotations and Ho displacements in the non-centrosymmetric Pna21 space group engineer ferroelectricity. The results indicate that occurrence of polar order in HoCrO3 resembles neither the typical case of proper ferroelectrics nor the improper ferroelectrics.

Graphical abstract: Atypical multiferroicity of HoCrO3 in bulk and film geometry

Supplementary files

Article information

Article type
Paper
Submitted
27 Jan 2015
Accepted
14 Mar 2015
First published
16 Mar 2015

J. Mater. Chem. C, 2015,3, 4162-4167

Author version available

Atypical multiferroicity of HoCrO3 in bulk and film geometry

A. Ghosh, A. Pal, K. Dey, S. Majumdar and S. Giri, J. Mater. Chem. C, 2015, 3, 4162 DOI: 10.1039/C5TC00269A

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