Magnetic order in low and high stage FeCl3 intercalated graphite

Investigation of the Electric and Magnetic Properties of Intercalated Graphites.

“…Thus stage S seems to be the dividing stage between the metalic behavior, low stages, and activated behavior, high stages. The behavior of the c-axis resistivity is in qualitative agreement with the theory of Sugihara [21] which attributes the c-axis conductivity to a phonon assisted hopping mechanism. We have also measured the in-plane resistivity of selected samples of FeCI 3 GIC's at selected temperatures in connection with our galvanomagnetic measurements, (see following section).…”

“…Here we have computed the ground-state energy of such an extended system on a honeycomb lattice and found its value to be within 1% of thas dotermine for nearest neighbor interactions only. Moreover, we found that the ground-tate dqpneracy specified by (21) and (23), which was derived for only nearest neighbor interactions, also holds for extended neighbor interactions.…”

“…We found that in zero field the degeneracy persists. In non-zero field, the magnetic field selects a particular dipole configuration which in low fields resembles one of the patterns described by (21) and (23). Two such configurations, for fields along the horizontal and vertical directions, are shown in figures 2 and 3.…”

“…One observes that at low temperature, i.e. frame "a" of each figure, the dipole pattern resembles one of the zero field groundstate patterns specified by (21) and (23). Thus the application of the magnetic field lifts the degeneracy.…”

“…For general A and T 0 0 (16) was solved by means of a numerical iterative method starting from state* specified by (21) and ( Table I. By symmetry, the behavior is identical modulo 60*, although the pairing will vary.…”