Abstract
Abstract
We report the temperature dependence of the Yb valence in the geometrically frustrated compound
Y
b
B
4
from 12 to 300 K using resonant x-ray emission spectroscopy at the Yb
L
α
1
transition. We find that the Yb valence, v, is hybridized between the v = 2 and v = 3 valence states, increasing from
v
=
2.61
±
0.01
at 12 K to
v
=
2.67
±
0.01
at 300 K, confirming that
Y
b
B
4
is a Kondo system in the intermediate valence regime. This result indicates that the Kondo interaction in
Y
b
B
4
is substantial, and is likely to be the reason why
Y
b
B
4
does not order magnetically at low temperature, rather than this being an effect of geometric frustration. Furthermore, the zero-point valence of the system is extracted from our data and compared with other Kondo lattice systems. The zero-point valence seems to be weakly dependent on the Kondo temperature scale, but not on the valence change temperature scale T
v
.
Funder
Natural Sciences and Engineering Research Council of Canada
National Research Foundation of Korea
Canada Foundation for Innovation
Ontario Research Fund
National Science Foundation
Subject
Condensed Matter Physics,General Materials Science
Cited by
1 articles.
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