Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-02-13
Phys. Rev. B 74, 094508 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 4 figures
Scientific paper
10.1103/PhysRevB.74.094508
It is shown that a quasi two dimensional (layered) Heisenberg antiferromagnet with fully frustrated interplane couplings ({\it e.g.} on a body-centered tetragonal lattice) generically exhibits two thermal phase transitions with lowering temperature -- an upper transition at $T_{TO}$ (``order from disorder without order'') in which the lattice point-group symmetry is spontaneously broken, and a lower N\'{e}el transition at $T_{N}$ at which spin-rotation symmetry is broken. Although this is the same sequence of transitions observed in La$_2$CuO$_4$, in the Heisenberg model (without additional lattice degrees of freedom) $(T_{TO}-T_N) /T_N$ is much smaller than is observed. The model may apply to the bilayer cuprate La$_2$CaCuO$_6$, in which the transitions are nearly coincident.
Brown Stuart
Chen Fangpei
Hu Jiangping
Kivelson Steven
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