Universität zu Köln

Dhanasekhar, C., Das, A. K., Singh, Ripandeep, Das, A., Giovannetti, G., Khomskii, D. and Venimadhav, A. (2017). Switching from pyroelectric to ferroelectric order in Ni-doped CaBaCo4O7. Phys. Rev. B, 96 (13). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We report ferroelectric ordering in Ni-substituted CaBaCo4O7. Magnetization showed ferrimagnetic transition at 60 K and an additional magnetic anomaly is found at similar to 82 K. The enhanced antiferromagnetic interactions and decrease in saturation magnetization are noticed with Ni substitution. The dielectric and pyroelectric measurements illustrate strong coupling between spin and charge degrees of freedom. Ferroelectric behavior is confirmed with enhanced ordering temperature (similar to 82 K) and saturation polarization (250 mu C/m(2)). Neutron diffraction has revealed an increase in c-lattice parameter in the Ni sample. All the Co/Ni moments are reoriented in the a direction. A transition from a noncollinear ferrimagnetic to a collinear ferrimagnetic spin order, with up arrow up arrow down arrow down arrow antiferromagnetic ordering in the kagome layer, is observedwith substitution. This results in the appearance of unequal bond distances in a two-dimensional collinear layer; most likely this is responsible for the transition from pyroelectric to ferroelectric, with the possibility of switching of electric polarization.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Dhanasekhar, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Das, A. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Singh, Ripandeep UNSPECIFIED UNSPECIFIED UNSPECIFIED Das, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Giovannetti, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Khomskii, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Venimadhav, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-214399
DOI:	10.1103/PhysRevB.96.134413
Journal or Publication Title:	Phys. Rev. B
Volume:	96
Number:	13
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SINUSOIDAL TEMPERATURE WAVES; TOTAL-ENERGY CALCULATIONS; NONPYROELECTRIC CURRENTS; BASIS-SET; MAGNETISM Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21439