Field-Induced Magnetic Transitions in the One-Dimensional Compound Ca3Co2O6

Kageyama, Hiroshi; Yoshimura, Kazuyoshi; Koyamada, Koji; Mitamura, H.; Goto, T.

doi:10.1143/jpsj.66.1607

Cited by 232 publications

(270 citation statements)

References 14 publications

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“…Magnetic susceptibility data revealed the onset of magnetic ordering below T C1 = 24 K [3,4,5]. In addition, a second transition was found at T C2 = 12 K [4,5].…”

Section: Introductionmentioning

confidence: 94%

Extended moment formation and magnetic ordering in the trigonal chain compound Ca3Co2O6

Eyert

Laschinger

Kopp

et al. 2004

Chemical Physics Letters

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The results of electronic structure calculations for the one-dimensional magnetic chain compound Ca 3 Co 2 O 6 are presented. The calculations are based on density functional theory and the local density approximation and used the augmented spherical wave (ASW) method. Our results allow for deeper understanding of recent experimental findings. In particular, alternation of Co 3d low-and high-spin states along the characteristic chains is related to differences in the oxygen coordination at the inequivalent cobalt sites. Strong hybridization of the d states with the O 2p states lays ground for polarization of the latter and the formation of extended localized magnetic moments centered at the high-spin sites. In contrast, strong metal-metal overlap along the chains gives rise to intrachain ferromagnetic exchange coupling of the extended moments via the d 3z 2 −r 2 orbitals of the low-spin cobalt atoms.

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“…Magnetic susceptibility data revealed the onset of magnetic ordering below T C1 = 24 K [3,4,5]. In addition, a second transition was found at T C2 = 12 K [4,5].…”

Section: Introductionmentioning

confidence: 94%

Extended moment formation and magnetic ordering in the trigonal chain compound Ca3Co2O6

Eyert

Laschinger

Kopp

et al. 2004

Chemical Physics Letters

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“…While the origin of the 10K-transition has been controversial, available literature viewed together suggests an inhomogeneous nature of the magnetic phase below T2 [6]. The 24K-transition is attributable to a not-so-common 'partially disordered antiferromagnetic (PDA) structure' [3,4], in which two out of three magnetic chains are antiferromagnetically ordered. Another exciting aspect of this compound is that there are multiple steps in the isothermal magnetization (M) at an interval of about 12 kOe well below 10 K [3,4,7]; there is a recent attempt to explain this in terms of an interesting phenomenon called 'quantum tunneling' [9] usually known among molecular magnets.…”

Section: Introductionmentioning

confidence: 99%

“…The 24K-transition is attributable to a not-so-common 'partially disordered antiferromagnetic (PDA) structure' [3,4], in which two out of three magnetic chains are antiferromagnetically ordered. Another exciting aspect of this compound is that there are multiple steps in the isothermal magnetization (M) at an interval of about 12 kOe well below 10 K [3,4,7]; there is a recent attempt to explain this in terms of an interesting phenomenon called 'quantum tunneling' [9] usually known among molecular magnets. Other interesting aspects of this compound have been brought out in many recent papers [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Negative chemical pressure effects induced by Y substitution for Ca on the ‘exotic’ magnetic behavior of the spin-chain compound, Ca3Co2O6

Rayaprol

Sampathkumaran

2005

Pramana - J Phys

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The magnetic behavior of a solid solution, Ca 3-x Y x Co 2 O 6 , based on an 'exotic' spin-chain compound, Ca 3 Co 2 O 6 , crystallizing in K 4 CdCl 6 -derived rhombohedral structure is investigated. Among the compositions investigated (x= 0.0, 0.3, 0.5, 0.75 and 1.0), single phase formation persists up to x= 0.75, with the elongation of the c-axis. The present investigations reveal that the temperature at which the 'so-called' 'partially disordered antiferromagnetic structure' sets in (which occurs at 24 K for the parent compound, x= 0.0) undergoes gradual reduction with the substitution of Y for Ca, attaining the value of about 2.2 K for the nominal x = 1.0. The trend observed in this characteristic temperature is opposite to that reported under external pressure, thereby establishing that Y substitution exerts negative chemical pressure. Anomalous steps observed in the isothermal magnetization at very low temperatures (around 2 K) for x= 0.0, which have been proposed to arise from 'quantum tunneling effects' are found to vanish by a small substitution (x = 0.3) of Y for Ca. Systematics in ac and dc magnetic susceptibility behavior with Y substitution for Ca have also been probed. We believe that the present results involving the expansion of chain length without disrupting the magnetic chain may be useful to the overall understanding of the novel magnetism of the parent compound.

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“…It should be noted that there are no marked anomalies in the ZF-µ + SR results around 10 K corresponding to the ferrimagnetic transition temperature. [12] This is very reasonable because the ferrimagnetism is induced by the external field.…”

Section: Figures 4(a) -4(d)mentioning

confidence: 99%

“…It was found that Ca 3 Co 2 O 6 exhibits a transition from a paramagnetic to an antiferromagnetic state below 24 K (=T N ), [11] although the magnetic structure is not fully understood even after neutron scattering studies, probably due to the competition between the intra-chain ferromagnetic (F) and inter-chain antiferromagnetic (AF) interactions. [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 ).…”

Section: Introductionmentioning

confidence: 99%

Two dimensionality in quasi-one-dimensional cobalt oxides

Sugiyama

Nozaki

Brewer

et al. 2006

Physica B: Condensed Matter

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By means of muon spin rotation and relaxation (µ + SR) techniques, we have investigated the magnetism of quasi one-dimensional (1D) cobalt oxides AEn+2Con+1O3n+3 (AE=Ca, Sr and Ba, n=1, 2, 3, 5 and ∞), in which the 1D CoO3 chain is surrounded by six equally spaced chains forming a triangular lattice in the ab-plane, using polycrystalline samples, from room temperature down to 1.8 K. For the compounds with n=1 -5, transverse field µ + SR experiments showed the existence of a magnetic transition below ∼100 K. The onset temperature of the transition (T on c ) was found to decrease with n; from 100 K for n=1 to 60 K for n=5. A damped muon spin oscillation was observed only in the sample with n=1 (Ca3Co2O6), whereas only a fast relaxation obtained even at 1.8 K in the other three samples. In combination with the results of susceptibility measurements, this indicates that a two-dimensional short-range antiferromagnetic (AF) order appears below T on c for all compounds with n=1 -5; but quasi-static long-range AF order formed only in Ca3Co2O6 , below 25 K. For BaCoO3 (n=∞), as T decreased from 300 K, 1D ferromagnetic (F) order appeared below 53 K, and a sharp 2D AF transition occurred at 15 K.

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Field-Induced Magnetic Transitions in the One-Dimensional Compound Ca₃Co₂O₆

Cited by 232 publications

References 14 publications

Extended moment formation and magnetic ordering in the trigonal chain compound Ca3Co2O6

Extended moment formation and magnetic ordering in the trigonal chain compound Ca3Co2O6

Negative chemical pressure effects induced by Y substitution for Ca on the ‘exotic’ magnetic behavior of the spin-chain compound, Ca3Co2O6

Two dimensionality in quasi-one-dimensional cobalt oxides

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