Physics – Condensed Matter – Materials Science
Scientific paper
2012-01-04
Physics
Condensed Matter
Materials Science
17 pages with 6 figures including supporting information. Submitted to Physical Review B. corresponding author email: sundares
Scientific paper
Rare-earth orthochromites RCrO3 (R=rare-earth), with centrosymmetric orthorhombic structures (Pnma), exhibit antiferromagnetic ordering of the Cr3+ moments (TN = 120 - 300 K) with weak ferromagnetism. We demonstrate that below TN these perovskites become ferroelectric with fairly large spontaneous polarization ~ 0.2 - 0.5 \muC/cm2 only when the rare-earth ion is magnetic (R = Sm, Gd, Tb and Tm), indicating the crucial role of magnetic interactions between R3+ and Cr3+ ions in inducing ferroelectric polarization. We suggest that ferroelectricity occurs in rare-earth orthochromites and orthoferrites containing magnetic rare-earths due to the instability of the symmetric position of rare earths ions in the exchange field of Cr(Fe) - the magnetic analog of Jahn-Teller effect.
Khomskii Daniel I.
Rajeswaran B.
Rao C. N. R.
Sundaresan Alamelu
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