Electron paramagnetic resonance (EPR) investigations of the local environment around Co2+ ions doped in PbMoO4 single crystals - Correlation with optical studies
PBN-AR
Instytucja
Instytut Fizyki Molekularnej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Optical Materials
ISSN
0925-3467
EISSN
Wydawca
ELSEVIER SCIENCE BV
DOI
URL
Rok publikacji
2013
Numer zeszytu
12
Strony od-do
2296-2302
Numer tomu
35
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(liczba autorów: 5)
Pozostali autorzy
+ 4
Streszczenia
Język
en
Treść
The electron paramagnetic resonance (EPR) measurements of PbMoO4 single crystals doped with Co2+ ions (0.5 wt.\%) carried out at temperature range 10-12 K are reported. The observed spectra reveal evidently two major groups of EPR spectra, each group consists of eight hyperfine structure components associated with the Co nuclear spin I = 7/2. Additionally, EPR spectra of the unintentional impurities have been observed, which have been assigned to Nd3+ ions in PbMoO4. The analysis of the various characteristic features of the EPR spectra as well as our earlier optical absorption studies of Co2+:PbMoO4 indicate that the Co2+ ions are located at two crystallographically distinct complexes, denoted Co2+(alpha) and Co2+(beta). The fictitious `spin' S' = 1/2 has been assigned to the observed ground Kramers doublet state of each of the two Co2+ complexes tentatively identified as located at the Mo sites in PbMoO4. The spin Hamiltonian parameters for Co2+ (S' = 1/2) ions in PbMoO4, including the components of the Zeeman and hyperfine structure tensors g(ij) and A(ij), respectively, are experimentally determined for the first time. Comparison of our results with the values of g(ij) and A(ij) for Co2+ ions in other structurally similar compounds further strengthens this conclusion. Correlation of the present results with those obtained earlier from optical studies is discussed. Alternative assignments of the ground states and options for the origin of the `spin' S' = 1/2 for Co2+ ions in PbMoO4 will be considered in a subsequent paper. (C) 2013 Elsevier B.V. All rights reserved.
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System-identifier
607825
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