Physics – Condensed Matter
Scientific paper
1995-10-29
Physics
Condensed Matter
12 pages of LaTex, 4 figures availavule upon request
Scientific paper
10.1143/JPSJ.65.46
We examined a two-dimensional Heisenberg model with two kinds of exchange energies, $J_e$ and $J_c$. This model describes localized spins at vanadium ions in a layer of CaV$_4$O$_9$, for which a spin gap is found by a recent experiment. Comparing the high temperature expansion of the magnetic susceptibility to experimental data, we determined the exchange energies as $J_e \simeq$ 610 K and $J_c \simeq$ 150 K. By the numerical diagonalization we estimated the spin gap as $\Delta \sim 0.2J_e \simeq$ 120 K, which consists with the experimental value 107 K. Frustration by finite $J_c$ enhances the spin gap.
Sano Kazuhiro
Takano Ken'ichi
No associations
LandOfFree
Spin Gap of Two-Dimensional Antiferromagnet Representing CaV$_4$O$_9$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Spin Gap of Two-Dimensional Antiferromagnet Representing CaV$_4$O$_9$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin Gap of Two-Dimensional Antiferromagnet Representing CaV$_4$O$_9$ will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-395686