Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2009-08-24
Phys. Rev. B 80 (2009) 174410
Physics
Condensed Matter
Statistical Mechanics
8 pages, 6 figures
Scientific paper
The generalized decoration-iteration transformation is adopted to treat exactly a hybrid model of doubly decorated two-dimensional lattices, which have localized Ising spins at their nodal lattice sites and itinerant electrons delocalized over pairs of decorating sites. Under the assumption of a half filling of each couple of the decorating sites, the investigated model system exhibits a remarkable spontaneous antiferromagnetic long-range order with an obvious quantum reduction of the staggered magnetization. It is shown that the critical temperature of the spontaneously long-range ordered quantum antiferromagnet displays an outstanding non-monotonic dependence on a ratio between the kinetic term and the Ising-type exchange interaction.
Canova Lucia
Strecka Jozef
Tanaka Akinori
Verkholyak Taras
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