Magnetic phase diagram of layered cobalt dioxide LixCoO2.
The magnetism of LixCoO2 (LCO), which has a similar structure to NaxCoO2 (NCO), has been investigated by muon-spin spectroscopy and susceptibility measurements using samples with x=0.1-1 prepared by an electrochemical reaction. In the x range below 0.75, LCO was found to be Pauli paramagnetic down to 1.8 K, suggesting an intermediate- or weak-coupling regime, although disordered local moments, with volume fractions below approximately 20%, appear at low T for LCO with x > or = 0.5. The phase diagram and interactions of LCO are thus strikingly different from NCO, while the differences cannot be explained simply by structural differences between the two systems.
Mukai
K
K
Toyota Central Research and Development Labs Inc, Nagakute, Aichi, Japan.
Ikedo
Y
Y
Nozaki
H
H
Sugiyama
J
J
Nishiyama
K
K
Andreica
D
D
Amato
A
A
Russo
P L
PL
Ansaldo
E J
EJ
Brewer
J H
JH
Chow
K H
KH
Ariyoshi
K
K
Ohzuku
T
T
D003035:Cobalt / Q000737:chemistry; D008280:Magnetics
D003035:Cobalt