Universität zu Köln

Rajeswaran, B., Khomskii, D. I., Zvezdin, A. K., Rao, C. N. R. and Sundaresan, A. (2012). Field-induced polar order at the Neel temperature of chromium in rare-earth orthochromites: Interplay of rare-earth and Cr magnetism. Phys. Rev. B, 86 (21). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1098-0121

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Abstract

We report field-induced switchable polarization (P similar to 0.2-0.8 mu C/cm(2)) below the Neel temperature of chromium (T-N(Cr)) in weakly ferromagnetic rare-earth orthochromites, RCrO3 (R = rare earth) but only when the rare-earth ion is magnetic. Intriguingly, the polarization in ErCrO3 (T-C = 133 K) disappears at a spin-reorientation (Morin) transition (T-SR similar to 22 K) below which the weak ferromagnetism associated with the Cr sublattice also disappears, demonstrating the crucial role of weak ferromagnetism in inducing the polar order. Further, the polarization (P) is strongly influenced by an applied magnetic field, indicating a strong magnetoelectric effect. We suggest that the polar order occurs in RCrO3, due to the combined effect of the poling field that breaks the symmetry and the exchange field on the R ion from the Cr sublattice that stabilizes the polar state. We propose that a similar mechanism could work in the isostructural rare-earth orthoferrites RFeO3 as well. DOI: 10.1103/PhysRevB.86.214409

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rajeswaran, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Khomskii, D. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zvezdin, A. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rao, C. N. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sundaresan, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-476826
DOI:	10.1103/PhysRevB.86.214409
Journal or Publication Title:	Phys. Rev. B
Volume:	86
Number:	21
Date:	2012
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1098-0121
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MULTIFERROICS; FERROELECTRICITY; GDCRO3 Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47682