Abstract
Abstract
We have performed a powder neutron diffraction study on CsO2, where the unpaired electron with
s
=
1
/
2
in the
π
∗
orbital of the O
2
−
ion is responsible for the magnetism. The magnetic reflections 0
1
2
0 and 0
1
2
1 were observed below the Néel temperature of about 10 K. An antiferromagnetic structure with a propagation vector of (0,
1
2
, 0) and magnetic moments parallel to the a-axis is the most plausible. The magnitude of the ordered moment is about 0.2 µ
B
, which is considered to be strongly reduced due to the one-dimensionality of the system. We propose a possible
π
∗
orbital order that can explain the obtained magnetic structure, and discuss its relation to the one-dimensionality.
Subject
Condensed Matter Physics,General Materials Science
Cited by
1 articles.
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