Abstract
Abstract
Cobalt Prussian blue analogues (Na
x
Co[Fe(CN)6]
y
;
x
∼
4
y
−
3
) whose valences are close to
Co
3
+
and
Fe
2
+
show characteristic phase transitions triggered by cooperative charge transfer (CT) from
Fe
2
+
to
Co
3
+
. Here, we extended the cooperative CT to the entire region of sodium concentration (
0
≤
x
≤
4
y
−
2
). We systematically investigated (1) upper (
T
c
u
) and lower (
T
c
l
) critical temperature, (2) variation of the [
Fe
2
+
(CN)6]
4
−
([
Fe
3
+
(CN)6]
3
−
) concentration, and (3) spectral weight (
I
ET
) due to electron transfer from
Fe
2
+
to
Co
3
+
of thin films of Na
x
Co[Fe(CN)6]0.82 against x. In a wide x region from 0.00 to 0.57, we observed first-order phase transition triggered by the cooperative CT. The extended CT model reproduces the x-dependent behavior of the [FeII(CN)6]
4
−
([FeIII(CN)6]
3
−
) concentration and
I
ET
, except for the high-x region above
x
∼
0.9
.
Funder
Japan Society for the Promotion of Science
Murata Science Foundation
Subject
General Physics and Astronomy,Physics and Astronomy (miscellaneous),General Engineering
Cited by
2 articles.
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