Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-11-03
Phys. Rev. B 76, 174406 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 5 figures
Scientific paper
10.1103/PhysRevB.76.174406
The Heisenberg antiferromagnet on the Kagom\'{e} lattice is studied in the framework of Schwinger-boson mean-field theory. Two solutions with different symmetries are presented. One solution gives a conventional quantum state with $\mathbf{q}=0$ order for all spin values. Another gives a gapped spin liquid state for spin $S=1/2$ and a mixed state with both $\mathbf{q}=0$ and $\sqrt{3}\times \sqrt{3}$ orders for spin $S>1/2$. We emphasize that the mixed state exhibits two sets of peaks in the static spin structure factor. And for the case of spin $S=1/2$, the gap value we obtained is consistent with the previous numerical calculations by other means. We also discuss the thermodynamic quantities such as the specific heat and magnetic susceptibility at low temperatures and show that our result is in a good agreement with the Mermin-Wagner theorem.
Li Peng
Shen Shun-Qing
Su Haibin
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