Bala, Nisha and Singh, H. K. and Verma, Shikha and Rath, Shyama (2020) Magnetic-order induced effects in nanocrystalline NiO probed by Raman spectroscopy. Physical Review B, 102 (2). 024423-024429. ISSN 2469-9950
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Abstract
The magnetic-order induced effects in nanocrystalline NiO are investigated through the phonons and magnons observed in the Raman spectra. The key observations are (i) an anisotropy of the first-order transverse and longitudinal optical phonons, with a splitting on the order of 5 meV and (ii) a marked size and excitation wavelength variation of the two-magnon peak, which varies linearly with a redshift of similar to 50 cm(-1) with a size reduction from 105 to 30 mm The magnon-related peaks, in contrast to the phonons, are suppressed for near-resonance laser excitations. The experimental results are interpreted in terms of the exchange interactions and strong electron-electron correlations. The magnetization measurements shows a crossover to ferromagnetism with large coercivities and magnetization with decreasing size, which is shown to be due to the thermoinduced contribution.
| Item Type: | Article |
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| Additional Information: | Copyright for this article belongs to M/s American Physical Society. |
| Subjects: | Multidisciplinary Materials Science Applied Physics/Condensed Matter |
| Divisions: | UNSPECIFIED |
| Depositing User: | Mr. Yogesh Joshi |
| Date Deposited: | 25 Mar 2022 10:14 |
| Last Modified: | 25 Mar 2022 10:14 |
| URI: | http://npl.csircentral.net/id/eprint/4800 |
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