An EPR study of trigonally symmetric Cr3+ centres in TlZnF3 single crystals

EPR measurements have been made on the single crystals of TlZnF3 doped with chromium and co-doped with chromium and lithium. For the Cr-only doped crystal, three kinds of Cr3+ spectra with trigonal symmetry were observed. These centres are ascribed respectively to a charge-uncompensated Cr3+ ion at...

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Published inJournal of physics. Condensed matter Vol. 17; no. 29; pp. 4653 - 4663
Main Authors Ebisu, H, Arakawa, M, Takeuchi, H
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 27.07.2005
Institute of Physics
Subjects
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron paramagnetic resonance and relaxation
Exact sciences and technology
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Physics
Monocrystals
Vacancies
Impurities
Doping
Zinc fluorides
Impurity site
Chromium additions
Electron paramagnetic resonance
Codoping
Thallium fluorides
Lithium additions
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Summary:EPR measurements have been made on the single crystals of TlZnF3 doped with chromium and co-doped with chromium and lithium. For the Cr-only doped crystal, three kinds of Cr3+ spectra with trigonal symmetry were observed. These centres are ascribed respectively to a charge-uncompensated Cr3+ ion at the Zn2F9 unit (Zn site II), a Cr3+ ion associated with a nearest Zn2+ vacancy at the Zn2F9 unit, and a charge-uncompensated Cr3+ ion at the ZnF6 unit (Zn site I). In the Cr, Li co-doped crystal, preferential formation of a Cr3+-Li+ pair at the Zn2F9 unit was found. The ligand octahedra are considered to be elongated in the Cr3+-Zn2+ and the Cr3+-Li+ centres at the Zn2F9 units and compressed in the Cr3+ centre at the ZnF6 unit.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/17/29/008