Issue |
Europhys. Lett.
Volume 63, Number 2, July 2003
|
|
---|---|---|
Page(s) | 282 - 288 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-00516-1 | |
Published online | 01 November 2003 |
: A candidate system
for purely oxygen antiferromagnet?
1
Moscow State University - 119899, Moscow, Russia
2
Ural State University - 620083, Ekaterinburg, Russia
3
Max Planck Institut für Chemische Physik Fester Stoffe
D-01187, Dresden, Germany
4
Leibniz Institut für Festkörper- und Werkstofforschung Dresden
D-01171, Dresden, Germany
5
TU-Clausthal, Institut für Mineralogie und Mineralische Rohstoffe
D-38678, Clausthal-Zellerfeld, Germany
Received:
23
January
2003
Accepted:
18
May
2003
Nuclear quadrupole resonance (-NQR)
measurements in
have revealed an unexpected
puzzling picture evidencing the absence of a noticeable local
hyperfine magnetic field on
nuclei in
the antiferromagnetically ordered state below
, and considerable charge redistribution as compared
with the
counterpart system. Unconventional
“nonmagnetic” behavior of copper ions in
points
to a possibly nonmagnetic
copper valent
state with antiferromagnetically ordered oxygen
surroundings. It means that the hole in the
cell
should be localized at oxygen, rather than at copper sites. We
suggest a qualitative physical reasoning for the “sp
hybridization induced oxygen hole stabilization effect” which is
believed to be more pronounced in
as compared with
.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.28.+d – Narrow-band systems; intermediate-valence solids / 76.60.-k – Nuclear magnetic resonance and relaxation
© EDP Sciences, 2003
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