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Suzuki, Masatsugu; Suzuki, Itsuko S.; Johnson, Mitchell D.; Morillo, J.

doi:10.1103/physrevb.50.205

Cited by 6 publications

(5 citation statements)

References 20 publications

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“…The disappearance of long-range spin order with increasing Cu concentration is due to the spin-frustration effect arising from competing ferromagnetic and antiferromagnetic intraplanar exchange interactions. This tendency of the disappearance of ζ LS is consistent with the results derived from the value of the dc magnetic susceptibility at 5 K versus the Cu concentration for stage-2 Cu c Co 1−c Cl 2 GICs [10]. Note that no appreciable spin-fluctuation part is observed for stage-1 Cu c Co 1−c Cl 2 GICs with 0.50 c 0.90 in spite of the fact that ferromagnetic phase transitions still weakly occur near 10 K. The degree of spin ordering in these compounds is strongly influenced by the competing intraplanar exchange interactions J (Co-Co), J (Cu-Co), and J (Cu-Cu).…”

Section: Critical Behaviour Of Magnetic Resistivitysupporting

confidence: 90%

“…The dc magnetic susceptibility was measured using a Faraday balance method in the temperature range between 100 and 300 K. A quartz bucket containing the sample was suspended from a fine quartz fibre attached to a Cahn electrobalance. The dc magnetic susceptibility of Cu c Co 1−c Cl 2 GICs obeys the Curie-Weiss law in the temperature range between 150 and 300 K [10]. The effective magnetic moment P eff (c) derived from the Curie-Weiss constant is predicted as…”

Section: Methodsmentioning

confidence: 92%

“…In figure 10(b) we show the plot of T c versus Cu concentration c for stage-1 Cu c Co 1−c Cl 2 GICs determined from the ac magnetic susceptibility and resistivity measurements. For comparison we also show the plot of T c versus c for stage-2 Cu c Co 1−c Cl 2 GICs determined from the ac magnetic susceptibility measurements [10]. The magnetic phase diagram of stage-1 compounds is essentially the same as that of stage-2 compounds in spite of the fact that the interplanar exchange interaction in stage-2 compounds is much weaker than that in stage-1 compounds.…”

Section: The Ac Magnetic Susceptibilitymentioning

confidence: 99%

“…c Co 1−c Cl 2 GICs [10,11] The magnetic properties of stage-2 Cu c Co 1−c Cl 2 GICs are considered to be almost the same as those of stage-1 Cu c Co 1−c Cl 2 GICs. Here we show the magnetic properties of stage-2 Cu c Co 1−c Cl 2 GICs which have been studied in detail [11].…”

Section: Magnetic Properties Of Stage-2 Cumentioning

confidence: 99%

“…In section 2 we present a brief review on the magnetic properties of stage-2 Cu c Co 1−c Cl 2 GICs [10,11]. We also give a brief review on our model for the in-plane resistivity of stage-1 CoCl 2 GICs near T c .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Critical Behaviour Of Magnetic Resistivitysupporting

confidence: 90%

Section: Methodsmentioning

confidence: 92%

Section: The Ac Magnetic Susceptibilitymentioning

confidence: 99%