title: Magnetic phase diagram of layered cobalt dioxide LixCoO2.
abstract: 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.
authors.affiliation: Toyota Central Research and Development Labs Inc, Nagakute, Aichi, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Mukai
authors.forename: Y
authors.initials: Y
authors.lastname: Ikedo
authors.forename: H
authors.initials: H
authors.lastname: Nozaki
authors.forename: J
authors.initials: J
authors.lastname: Sugiyama
authors.forename: K
authors.initials: K
authors.lastname: Nishiyama
authors.forename: D
authors.initials: D
authors.lastname: Andreica
authors.forename: A
authors.initials: A
authors.lastname: Amato
authors.forename: P L
authors.initials: PL
authors.lastname: Russo
authors.forename: E J
authors.initials: EJ
authors.lastname: Ansaldo
authors.forename: J H
authors.initials: JH
authors.lastname: Brewer
authors.forename: K H
authors.initials: KH
authors.lastname: Chow
authors.forename: K
authors.initials: K
authors.lastname: Ariyoshi
authors.forename: T
authors.initials: T
authors.lastname: Ohzuku
mesh_terms: D003035:Cobalt / Q000737:chemistry; D008280:Magnetics
chemical_list: D003035:Cobalt