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- Title
Displacive-type ferroelectricity from magnetic correlations within spin-chain.
- Authors
Basu, Tathamay; Ravi Kishore, V. V.; Gohil, Smita; Singh, Kiran; Mohapatra, N.; Bhattacharjee, S.; Gonde, Babu; Lalla, N. P.; Mahadevan, Priya; Ghosh, Shankar; Sampathkumaran, E. V.
- Abstract
Observation of ferroelectricity among non-d° systems, which was believed for a long time an unrealistic concept, led to various proposals for the mechanisms to explain the same (i.e. magnetically induced ferroelectricity) during last decade. Here, we provide support for ferroelectricity of a displacive-type possibly involving magnetic ions due to short-range magnetic correlations within a spin-chain, through the demonstration of magnetoelectric coupling in a Haldane spin-chain compound Er2BaNiO5 well above its Néel temperature of (TN=) 32 K. There is a distinct evidence for electric polarization setting in near 60 K around which there is an evidence for short-range magnetic correlations from other experimental methods. Raman studies also establish a softening of phonon modes in the same temperature (T) range and T-dependent x-ray diffraction (XRD) patterns also reveal lattice parameters anomalies. Density-functional theory based calculations establish a displacive component (similar to d°-ness) as the root-cause of ferroelectricity from (magnetic) NiO6 chain, thereby offering a new route to search for similar materials near room temperature to enable applications.
- Subjects
FERROELECTRICITY; DISPLACIVE transformations; MAGNETIC ions; MAGNETOELECTRIC effect; SHORT-range order (Magnetic structure); HALDANE'S rule; RAMAN effect; DENSITY functional theory
- Publication
Scientific Reports, 2014, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep05636