2004
DOI: 10.1103/physrevb.70.014437
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Magnetic behavior ofCoions in the exotic spin-chain compoundCa3Co2

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Cited by 101 publications
(48 citation statements)
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“…Whilst the transition temperatures are considerably higher than for Ca 3 Co 2 O 6 , it appears that the magnetic behavior does not depend on the presence of one or two magnetic ions. Indeed in Ca 3 Co 2 O 6 , only one of the Co ions along the chain is magnetic 10,11 contrary to the other compounds in which the presence of two alternating magnetic ions leads to more complex exchange interactions along and between the chains. Besides, one would expect a gradual change from localized magnetism in the case of insulating 3d compounds to a magnetic behavior reminiscent of metals for the case of compounds containing 5d transition metal ions.…”
Section: Introductionmentioning
confidence: 99%
“…Whilst the transition temperatures are considerably higher than for Ca 3 Co 2 O 6 , it appears that the magnetic behavior does not depend on the presence of one or two magnetic ions. Indeed in Ca 3 Co 2 O 6 , only one of the Co ions along the chain is magnetic 10,11 contrary to the other compounds in which the presence of two alternating magnetic ions leads to more complex exchange interactions along and between the chains. Besides, one would expect a gradual change from localized magnetism in the case of insulating 3d compounds to a magnetic behavior reminiscent of metals for the case of compounds containing 5d transition metal ions.…”
Section: Introductionmentioning
confidence: 99%
“…[11,12] The valence state of the Co ions was assigned to be +3; also, the spin configuration of Co 3+ ions in the CoO 6 octahedron is the lowspin (LS) state with S=0 and in the CoO 6 prism the highspin (HS) state with S=2. [11,17,18] At lower temperatures, magnetization and 59 Co-NMR measurements suggested the existence of a ferrimagnetic transition around 10 K, [12,13,19] which, however, was not seen in the specific heat (C p ). [20] Furthermore, the C p measurement revealed an indication of either a short-range magnetic order or a gradual change in the spin state of Co ions at higher temperatures (100 -200 K).…”
Section: Introductionmentioning
confidence: 99%
“…[3][4][5][6][7][8][9][10][11][12][13][14] in the field of geometrically frustrated magnetism. This compound consists of infinite chains (along 'c') of alternating face-sharing CoO6 distorted octahedral and CoO6 distorted trigonal prisms (TP), where Co in octahedral site is in low-spin state due to crystal field effect and is non-magnetic (S=0) and Co in TP site is magnetic with high-spin state (S=1) [1,11]. The chains are separated by Ca atom in the 'ab' plane.…”
Section: Introductionmentioning
confidence: 99%