Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-12-04
Physics
Condensed Matter
Strongly Correlated Electrons
19 pages LATEX, 15 postscript figures, using jpsj.sty,to be published in J.Phys.Soc.Jpn. Vol.67 No.2 (1998)
Scientific paper
10.1143/JPSJ.67.564
Effects of possible orbital order in magnetic properties of two-dimensional spin gap system for CaV$_4$O$_9$ are investigated theoretically. After analyzing experimental data, we show that single orbital models assumed in the literature are insufficient to reproduce the data. To understand the origin of the discrepancy, we assume that in $d^1$ state of V, $d_{xz}$ and $d_{yz}$ orbitals have substantial contributions in the lowest-energy atomic level which leads to a double-degeneracy. We study possible configurations of the orbital order. By exact diagonalization and perturbation expansion, we calculate the susceptibility, wavenumber dependence of low-lying excitations and equal-time spin-spin correlations which is related to integrated intensity of the neutron inelastic scattering. These quantities sensitively depend on the configuration of the orbital order. The calculated results for some configurations of the orbital order reproduce many experimental results much better than the previous single-orbital models. However some discrepancy still remains to completely reproduce all of the reported experimental results. To understand the origin of these discrepancies, we point out the possible importance of the partially occupied $d_{xy}$ orbital in addition to orbital order of partially filled $d_{xz}$ and $d_{yz}$ orbitals.
Imada Masatoshi
Katoh Nobuyuki
No associations
LandOfFree
Orbital Order Effect of Two-Dimensional Spin Gap System for CaV4O9 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 Orbital Order Effect of Two-Dimensional Spin Gap System for CaV4O9, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Orbital Order Effect of Two-Dimensional Spin Gap System for CaV4O9 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-220858