Spin transition in Co3+ by optical absorption and time-resolved spectroscopy under pressure: an appraisal of the different spin states
This work investigates the electronic structure of CoF 3 by optical absorption and its relationship with the ground-state spin and the Jahn-Teller (JT) effect exhibited by Co 3+ (d 6 ) in octahedral coordination (CoF 6 ) 3− . The results are compared with other Co 3+ fluorides and oxides, where Co 3...
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Published in | High pressure research Vol. 28; no. 4; pp. 571 - 576 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Taylor & Francis
01.12.2008
|
Series | PROCEEDINGS OF THE XLVI TH EUROPEAN HIGH PRESSURE RESEARCH GROUP (EHPRG 46) MEETING, VALENCIA (SPAIN), 7–12 SEPTEMBER 2008 |
Subjects | |
Online Access | Get full text |
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Summary: | This work investigates the electronic structure of CoF
3
by optical absorption and its relationship with the ground-state spin and the Jahn-Teller (JT) effect exhibited by Co
3+
(d
6
) in octahedral coordination (CoF
6
)
3−
. The results are compared with other Co
3+
fluorides and oxides, where Co
3+
is high spin (HS) and low spin (LS), respectively. In CoF
3
we detect an absorption band with a doublet structure at 1.89 eV (657 nm) and 1.45 eV (855 nm) at 2.5 GPa, which is associated with the T ⊗ e JT effect on the
5
T
2
HS ground state. Absorption measurements under pressure have been carried out around the HS-LS (
5
T
2
↔
1
A
1
) spin crossover transition in the 0-20 GPa range. We show that the JT effect is stable in a wide pressure range. No sign of intermediate spin (
3
T
1, 2
states) is observed in the explored pressure range. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0895-7959 1477-2299 |
DOI: | 10.1080/08957950802552119 |