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We report field-induced switchable polarization (P = 0.2 ~ 0.8 microC/cm2)below the N\'eel temperature of chromium (TN Cr) in weakly ferromagneticrareearth orthochromites, RCrO3 (R=rareearth) but only when the rareearth ionis magnetic. Intriguingly, the polarization in ErCrO3 (TC ~ 133 K) disappearsat a spin reorientation (Morin) transition (TSR ~ 22 K) below which the weakferromagnetism associated with the Cr sublattice also disappears, demonstratingthe crucial role of weak ferromagnetism in inducing the polar order. Further,the polarization (P) is strongly influenced by applied magnetic field,indicating a strong magneto electric effect. We suggest that the polar orderoccurs in RCrO3, due to the combined effect of poling field that breaks thesymmetry and the exchange field on R ion from Cr sublattice stabilizes thepolar state. We propose that a similar mechanism could work in theisostructural rareearth orthoferrites, RFeO3 as well.

Field-induced Polar Order at the N\'eel Temperature of Chromium in Rare-earth Orthochromites: Interplay of Rare-earth and Cr Magnetism