Anisotropy and two-dimensional effects in the ESR properties ofOsF6-graphite intercalation compounds

1987 ◽  
Vol 35 (12) ◽  
pp. 6423-6431 ◽  
Author(s):  
D. Vaknin ◽  
D. Davidov ◽  
V. Zevin ◽  
H. Selig
Keyword(s):  
Intercalation Compounds ◽  
Two Dimensional ◽  
Graphite Intercalation Compounds ◽  
Dimensional Effects ◽  
Graphite Intercalation

Susceptibility of Magnetic Graphite-CoCl2 Intercalation Compounds

1982 ◽  
Vol 20 ◽  
Author(s):  
M Elahy ◽  
G. Dresselhaus
Keyword(s):  
Magnetic Susceptibility ◽  
Temperature Dependence ◽  
Theoretical Calculations ◽  
Experimental Results ◽  
Intercalation Compounds ◽  
Two Dimensional ◽  
Graphite Intercalation Compounds ◽  
Magnetic Systems ◽  
Planar Model ◽  
Graphite Intercalation

ABSTRACTPrecise measurements of the temperature dependence of the magnetic susceptibility for stage 2 and 5 graphite-CoCl2 intercalation compounds are reported. Comparison of the experimental results with theoretical calculations based on a two-dimensional planar model show agreement with theory, suggesting that graphite intercalation compounds represent ideal two-dimensional magnetic systems.

Structural and magnetic properties of random mixture graphite intercalation compounds

1990 ◽  
Vol 5 (2) ◽  
pp. 422-434 ◽  
Author(s):  
Masatsugu Suzuki ◽  
Louis J. Santodonato ◽  
Mildred Yeh ◽  
Samuel M. Sampere ◽  
Andrew V. Smith ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Intercalation Compounds ◽  
Ferromagnetic Phase ◽  
Two Dimensional ◽  
Graphite Intercalation Compounds ◽  
Weiss Temperature ◽  
Graphite Intercalation ◽  
Co Concentration ◽  
Structural And Magnetic Properties

The structural and magnetic properties of the stage 2 CocNi1−cCl2- and COcFe1−cCl2-graphite intercalation compounds (GICs) for 0 ≤ c ≤ 1 have been studied by x-ray scattering and dc magnetic susceptibility. The stage 2 CocNi1−cCl2-GICs approximate two-dimensional randomly-mixed ferromagnets with XY spin symmetry. The average effective magnetic moment Peff, the Curie-Weiss temperature θ, and the paramagnetic-to-ferromagnetic phase transition temperature Tc have been determined as continuously varying functions of Co concentration c. They indicate that the Co2+ and Ni2+ spins are randomly distributed on the triangular lattice sites of each intercalate layer. They also show that the intraplanar exchange interaction J(Co–Ni) between the Co2+ and Ni2+ spins is enhanced and is larger than the interaction J(Co–Co) between two Co2+ spins and J(Ni–Ni) between two Ni2+ spins. This enhanced interaction, J(Co–Ni), can be expressed as J(Co–Ni) = 1.28 [J(Co–Co) · J(Ni–Ni)]1/2. The stage 2 CocFc1−cCl2-GICs approximate two-dimensional randomly mixed ferromagnets with competing spin anisotropy. The dc magnetic susceptibility results suggest that Co2+, Fe3+ rather than Fe2+ are distributed in the intercalate layer. The repeat distance along the c-axis (d-spacing) versus Co concentration deviates from Vegard's law which states that the d-spacing is proportional to Co concentration. The broad peak of d-spacing observed at c = 0.75 is discussed in terms of the double layer model developed by Jin and Mahanti.

A Structural Analysis Method for Graphite Intercalation Compounds

2000 ◽  
Vol 658 ◽  
Author(s):  
Tatsuo Nakazawa ◽  
Kyoichi Oshida ◽  
Takashi Miyazaki ◽  
Morinobu Endo ◽  
Mildred S. Dresselhaus
Keyword(s):  
Image Analysis ◽  
Electronic Materials ◽  
Stage Structure ◽  
Intercalation Compounds ◽  
Two Dimensional ◽  
Analysis Method ◽  
Graphite Intercalation Compounds ◽  
Graphite Intercalation ◽  
Lattice Images ◽  
Stage 1

ABSTRACTStudy of the microstructure of electronic materials can be enhanced by using high resolution transmission electron microscopy (TEM) combined with the technique of digitized image analysis. We show here a practical image analysis method for the microstructures of acceptor graphite intercalation compounds (GICs) with CuCl2 and FeCl3 intercalates. The two dimensional fast Fourier transform (2D-FFT) was used for the frequency analysis of the TEM pictures. It is found that the lattice images of CuCl2-GICs consist of different frequency images corresponding to specific frequencies. The detailed features of the stage-1 structure of the FeCl3-GICs is extracted quantitatively by this method from a relatively indistinct TEM picture. The stage structure of the CuCl2- and FeCl3-GICs are further investigated by analyzing the reconstruction of the TEM images by means of the two dimensional inverse FFT (2D-IFFT).

Superconductivity in Graphite Intercalation Compounds

1982 ◽  
Vol 20 ◽  
Author(s):  
Yasuhiro Iye
Keyword(s):  
Intercalation Compounds ◽  
Two Dimensional ◽  
Graphite Intercalation Compounds ◽  
Elevated Pressures ◽  
Graphite Intercalation

ABSTRACTSuperconductivity in graphite intercalation compounds, C4nMHg (M:K, Rb, n=1,2) and C4KTl1.5 is studied in ambient as well as elevated pressures. It is argued that the major role in the superconductivity of this class of materials is played by electrons in the intercalant bands rather than those in the graphite bands. It is experimentally demonstrated that the two-dimensional anisotropy of the superconductivity is controlled by stage and pressure.

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