Photoinduced Electron Spin Resonance Phenomenon in α-Cr2O3 Nanospheres

The photoinduced phenomenon in α-Cr2O3 nanoscaled spherical particles was investigated in the temperature range of 150 up to 315 K. An X-band electron-spin resonance spectrometry was employed to probe the magnetic behavior in α-Cr2O3 under an IR illumination in the nanosecond regime....

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Main Authors:	S. Khamlich, V. V. Srinivasu, A. Konkin, N. Cingo, F. T. Thema, A. Benyoussef, M. Maaza
Format:	Article
Language:	English
Published:	Hindawi Limited 2015-01-01
Series:	Journal of Nanomaterials
Online Access:	http://dx.doi.org/10.1155/2015/831065

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record_format	Article
spelling	doaj-50963a19705a469f8b75d6a88dcb08ce2020-11-24T22:31:06ZengHindawi LimitedJournal of Nanomaterials1687-41101687-41292015-01-01201510.1155/2015/831065831065Photoinduced Electron Spin Resonance Phenomenon in α-Cr2O3 NanospheresS. Khamlich0V. V. Srinivasu1A. Konkin2N. Cingo3F. T. Thema4A. Benyoussef5M. Maaza6UNESCO Africa Chair in Nanosciences & Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, P.O. Box 392, Pretoria, South AfricaUNESCO Africa Chair in Nanosciences & Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, P.O. Box 392, Pretoria, South AfricaUNESCO Africa Chair in Nanosciences & Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, P.O. Box 392, Pretoria, South AfricaUNESCO Africa Chair in Nanosciences & Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, P.O. Box 392, Pretoria, South AfricaUNESCO Africa Chair in Nanosciences & Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, P.O. Box 392, Pretoria, South AfricaUNESCO Africa Chair in Nanosciences & Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, P.O. Box 392, Pretoria, South AfricaUNESCO Africa Chair in Nanosciences & Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk Ridge, P.O. Box 392, Pretoria, South AfricaThe photoinduced phenomenon in α-Cr2O3 nanoscaled spherical particles was investigated in the temperature range of 150 up to 315 K. An X-band electron-spin resonance spectrometry was employed to probe the magnetic behavior in α-Cr2O3 under an IR illumination in the nanosecond regime. The photoinduced effect on both low and high field ESR signals appears above 280 K and is remarkably enhanced just below Néel temperature TN. Such a photoinduced ESR phenomenon disappears in a reproducible way in the paramagnetic insulating state which occurs above TN of crystalline α-Cr2O3. In the antiferromagnetic phase, that is, below TN, the shift of the low field absorption could be attributed to the interaction of the light with specific Cr3+ ions located in strongly distorted sites correlated to strong ligand-field effect.http://dx.doi.org/10.1155/2015/831065
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	S. Khamlich V. V. Srinivasu A. Konkin N. Cingo F. T. Thema A. Benyoussef M. Maaza
spellingShingle	S. Khamlich V. V. Srinivasu A. Konkin N. Cingo F. T. Thema A. Benyoussef M. Maaza Photoinduced Electron Spin Resonance Phenomenon in α-Cr2O3 Nanospheres Journal of Nanomaterials
author_facet	S. Khamlich V. V. Srinivasu A. Konkin N. Cingo F. T. Thema A. Benyoussef M. Maaza
author_sort	S. Khamlich
title	Photoinduced Electron Spin Resonance Phenomenon in α-Cr2O3 Nanospheres
title_short	Photoinduced Electron Spin Resonance Phenomenon in α-Cr2O3 Nanospheres
title_full	Photoinduced Electron Spin Resonance Phenomenon in α-Cr2O3 Nanospheres
title_fullStr	Photoinduced Electron Spin Resonance Phenomenon in α-Cr2O3 Nanospheres
title_full_unstemmed	Photoinduced Electron Spin Resonance Phenomenon in α-Cr2O3 Nanospheres
title_sort	photoinduced electron spin resonance phenomenon in α-cr2o3 nanospheres
publisher	Hindawi Limited
series	Journal of Nanomaterials
issn	1687-4110 1687-4129
publishDate	2015-01-01
description	The photoinduced phenomenon in α-Cr2O3 nanoscaled spherical particles was investigated in the temperature range of 150 up to 315 K. An X-band electron-spin resonance spectrometry was employed to probe the magnetic behavior in α-Cr2O3 under an IR illumination in the nanosecond regime. The photoinduced effect on both low and high field ESR signals appears above 280 K and is remarkably enhanced just below Néel temperature TN. Such a photoinduced ESR phenomenon disappears in a reproducible way in the paramagnetic insulating state which occurs above TN of crystalline α-Cr2O3. In the antiferromagnetic phase, that is, below TN, the shift of the low field absorption could be attributed to the interaction of the light with specific Cr3+ ions located in strongly distorted sites correlated to strong ligand-field effect.
url	http://dx.doi.org/10.1155/2015/831065
work_keys_str_mv	AT skhamlich photoinducedelectronspinresonancephenomenoninacr2o3nanospheres AT vvsrinivasu photoinducedelectronspinresonancephenomenoninacr2o3nanospheres AT akonkin photoinducedelectronspinresonancephenomenoninacr2o3nanospheres AT ncingo photoinducedelectronspinresonancephenomenoninacr2o3nanospheres AT ftthema photoinducedelectronspinresonancephenomenoninacr2o3nanospheres AT abenyoussef photoinducedelectronspinresonancephenomenoninacr2o3nanospheres AT mmaaza photoinducedelectronspinresonancephenomenoninacr2o3nanospheres
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Photoinduced Electron Spin Resonance Phenomenon in α-Cr2O3 Nanospheres

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