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Transporte Ohmico y Ballístico en HOPG: Camino Libre Medio, Movilidades y Efectos Superconductores. 1. EARLIER STUDIES 2. PHYSICAL PROPERTIES: BINDING ENERGIES, ANYSOTROPIES, COMPRESSIBILITY,.. 3. IS GRAPHITE A METAL OR AN INSULATOR?, IS IT A GOOD CONDUCTOR?
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Work done in collaboration with P. Esquinazi (U. Leipzig)
C3=900meV/A^3, too , factor of 1.66, binding energy 54meV/C. Experimental 42mev/C
Medidas de compresibilidad prueban que la interacción es vdW
C3=900meV/Â^3, Girifalco and Lad,
EB(semi-semi)=68meV/C); Compre=3.1*10^132 cm^2/dyn
EB(semi-semi)=38meV/C); Compre=3.93*10-12 cm2/dyn
C=520meV/A3, obtained from
Polarizability and Clausius-Mossotti law.
free C atom
have energies of 3eV
for Cu=1.7mW.cm, Ti=43.1mW.cm.
The images show the in plane (a) and the c-axis orientation (b) of the crystallites of the HOPG sample. Note that the scan size is 600 x 200 µm and the crystallites observed here are in the 10 µm range of elongation, matching the results of EFM measurements.
D. Spoddig, Leipzig
Diagram of the electrostatic force microscopic measurement.
No structure in the surface AFM
Elemento de Grafito
CHANGE IN SLOPE AS A FUNCTION OF FIELD IS DUE TO LOCALIZATION.
AT SMALL FIELDS CARRIERS LOCALIZE
Las densidades del grafeno mayores que 2*10^10, el punto de
Dirac todavía esta lejos ~ 10^8
QUANTUM OSCILLATIONS WITH THE DENSITY OF CARRIERS (OR THE APPLIED VOLTAGE Vg)
Novoselov et al., Science 2004)
Zhang et al., Nature 2005
No SdH in the multigraphene!!!
Fig. 3: Usual ferromagnetic loop for a material with positive magnetoresistance. Note that the minima that occur at the coercive fields (zero or minimum of magnetization) are located at the third and fifth quartals, as expected. This is clearly qualitative different from the hysteresis loops fluxons in Josephson-coupled granular superconducting domains produce.Ciclo de Histeresis con H
Fig. 5: Surface resistance vs. external field (Fig.2 from Ref. of our manuscript) of a granular YBCO sample. Note the difference in the hysteresis to the ferromagnetic case (Fig. 3), in particular the quartals where the minima are located, i.e. second and fourth quartals. This behavior is identical to that observed in our sample (3), see Fig. 3 in our manuscript.Esta histeresis corresponde a Josephson coupling entre fluxones
However bombarded and non-bombarded graphite are magnetic
Magnetization of virgin graphite. Linear with T implies 2D
Exactly linear T