Transport properties in magnetic acceptor GICs

Kinanyalaoui, M.; Piraux, Luc; Bayot, Vincent; Issi, J.‐P.; Pernot, P.; Vangélisti, R.

doi:10.1016/0379-6779(89)90437-2

Cited by 13 publications

(7 citation statements)

References 4 publications

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“…19C). We note that similar WL in resistance have been reported in bulk magnetic-acceptor GICs (FeCl 3 , CoCl 2 ), 139,140 where the abrupt change of resistance has been connected with its magnetic transition. 47 As shown in Fig.…”

Section: Magnetismsupporting

confidence: 85%

Emerging field of few-layered intercalated 2D materials

et al. 2021

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Section: Magnetismsupporting

confidence: 85%

Emerging field of few-layered intercalated 2D materials

et al. 2021

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“…Recently transport properties of magnetic graphite intercalation compounds (GICs) near a critical temperature T c for the magnetic phase transition have aroused considerable interest [1][2][3][4][5][6][7][8][9]. In these compounds π-electrons in the graphite layers interact with magnetic spins in the intercalate layers through π -d exchange interactions.…”

Section: Introductionmentioning

confidence: 99%

Depolarized Light Scattering of Liquid Crystals with Addition of Carbon Tetrachloride in the Isotropic Phase

Shibata¹,

Matsuoka²,

Nomura³

1999

Jpn. J. Appl. Phys.

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Stage-1 Cu c Co 1−c Cl 2 graphite intercalation compounds approximate quasi-twodimensional (2D) random spin systems with competing ferromagnetic and antiferromagnetic intraplanar exchange interactions. The temperature dependence of the in-plane electrical resistivity of these compounds has been measured near critical temperatures. The magnetic resistivity ζ mag consists of the long-range spin-order part ζ LS and the spin-fluctuation part ζ SF . For 0 c 0.2 the long-range spin-order part ζ LS is dominant: the temperature dependence of ζ LS is described by a smeared power law with an exponent 2β, where β is the critical exponent of staggered magnetization. For 0.3 c 0.4 the spin-fluctuation part ζ SF becomes larger than ζ LS . For 0.5 c 0.95 no appreciable magnetic resistivity is observed. For c = 1 the derivative −dζ mag /dT shows a small peak at around 67 K due to the growth of short-range spin order which is characteristic of the 2D Heisenberg antiferromagnet. The critical behaviour of the in-plane resistivity can be explained in terms of a model based on π -d exchange interactions between π-electrons in the graphite layers and magnetic spins in the intercalate layers. The πelectrons are scattered by spins of a virtual antiferromagnetic in-plane spin configuration arising from the superposition of two ferromagnetic in-plane structures with spin directions antiparallel to each other. The π-d exchange interactions of these compounds are also discussed. † Present address: and the unpaired 3p electron of Cl − . Then the π-d exchange interaction J π −M can be rewritten asin terms of J M−M , where S = 1/2 for both the Cu 2+ spin and the fictitious spin of Co 2+ . The intraplanar exchange interaction J M−M is experimentally determined as 7.75 K for the CoCl 2 GIC and −39 K for the CuCl 2 GIC, which implies that J Co −Cl > 0 and J Cu −Cl < 0. It may be reasonable to assume that J π−Cl of the CoCl 2 GIC is equal to that of the CuCl 2 GIC because the graphite layer is sandwiched between two Cl − layers. Then the ratio of J π −Co to J π −Cu is expressed by

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“…Kinany-Alaoui et al 6) et al 29) et al 7) Stage-1 T N (K) 9.8 9 .8 7 .5 The above formula can consistently explain why the fieldinduced ferromagnetic state has a smaller resistance than that in the paramagnetic phase. The angular dependence under low magnetic fields is shown in Fig.…”

Section: Yeh Pirauxmentioning

confidence: 83%

“…Figure 6 shows the temperature dependence of the c-axis resistance without a magnetic field. As well as the in-plane resistance, 6,7,29) the c-axis resistance sharply rises just below 9.8K. The amplitude of the anomaly is only 3%, almost in the same order as the anomaly in the in-plane resistivity, although it depends on the researchers (see Table I).…”

Section: Cocl 2 Gic'smentioning

confidence: 84%

“…Since Shiozaki et al first reported negative magnetoresistances in MCl 2 GIC (M=Ni, Co and Cu), 5) indicating the existence of magnetic scattering by the guest ions, several groups have been investigating the transport properties of magnetic GIC's. Yeh et al 6) and Kinany-Alaoui et al 7) independently discovered an anomalous temperature dependence of the resistivity at the magnetic phase transition temperature. Sugihara et al 8) have given a theoretical model of this phenomenon.…”

Section: §1 Introductionmentioning

confidence: 99%

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Dimensional Crossover and Angular Dependent Magnetoresistance of Magnetic Graphite Intercalation Compounds; MCl₂GIC's (M=Cu and Co)

et al. 2000

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In order to consider the dimensionality and the interaction between conduction electrons and localized magnetic moments, angular dependences of the magnetoresistance of magnetic GIC's, stage-1 and stage-2 MCl 2 GIC's (M=Cu and Co) were measured. The c-axis (perpendicular to the graphite layers) resistance of stage-1 CuCl 2 GIC shows a typical angular dependent magnetoresistance oscillation (ADMRO) which is commonly observed in several quasi two-dimensional (2D) electron systems with a periodically-warped cylindrical Fermi surface. This proves a band conduction along the c-axis in spite of extremely large anisotropy in conductivity (ρ c /ρ a = 10 5 ). On the other hand, stage-2 CoCl 2 GIC shows a larger MR for the magnetic field along the c axis than that along the graphitic plane. In addition, ADMRO is absent in this compound. These suggest that the c-axis conduction is governed by incoherent interlayer hoppings. The angular dependence of MR in stage-2 CuCl 2 and stage-1 CoCl 2 GIC's show an intermediate behavior between that of stage-1 CuCl 2 GIC and stage-2 CoCl 2 GIC. The above material-dependence is attributed to the difference in interlayer coupling and suggests a dimensional crossover from a highly anisotropic three-dimensional (3D) system (stage-1 CuCl 2 GIC) to an almost pure 2D system (stage-2 CoCl 2 GIC). The c-axis resistances of stage-1 and stage-2 CoCl 2 GIC's reflect also the magnetic states of Co spins. This phenomenon is explained in terms of a model based on spin-dependent tunneling effect.

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Transport properties in magnetic acceptor GICs

Cited by 13 publications

References 4 publications

Emerging field of few-layered intercalated 2D materials

Emerging field of few-layered intercalated 2D materials

Depolarized Light Scattering of Liquid Crystals with Addition of Carbon Tetrachloride in the Isotropic Phase

Dimensional Crossover and Angular Dependent Magnetoresistance of Magnetic Graphite Intercalation Compounds; MCl₂GIC's (M=Cu and Co)

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Transport properties in magnetic acceptor GICs

Cited by 13 publications

References 4 publications

Emerging field of few-layered intercalated 2D materials

Emerging field of few-layered intercalated 2D materials

Depolarized Light Scattering of Liquid Crystals with Addition of Carbon Tetrachloride in the Isotropic Phase

Dimensional Crossover and Angular Dependent Magnetoresistance of Magnetic Graphite Intercalation Compounds; MCl2GIC's (M=Cu and Co)

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Dimensional Crossover and Angular Dependent Magnetoresistance of Magnetic Graphite Intercalation Compounds; MCl₂GIC's (M=Cu and Co)