Two-dimensional charge order in layered 2-1-4 perovskite oxides

Details Two-dimensional charge order in layered 2-1-4 perovskite oxides Two-dimensional charge order in layered 2-1-4 perovskite oxides

2002-11-23

arxiv.org/abs/cond-mat/0211520v2

Phys. Rev. Lett. 92, 236403 (2004)

Physics

Condensed Matter

Statistical Mechanics

5 pages including 6 figures, with major changes including discussion on charge ordering phenomena in layered perovskite oxides

Scientific paper

10.1103/PhysRevLett.92.236403

Monte Carlo simulations are performed on the three-dimensional (3D) Ising model with the 2-1-4 layered perovskite structure as a minimal model for checkerboard charge ordering phenomena in layered perovskite oxides. Due to the interlayer frustration, only 2D long-range order emerges with a finite correlation length along the c axis. Critical exponents of the transition change continuously as a function of the interlayer coupling constant. The interlayer long-range Coulomb interaction decays exponentially and is negligible even between the second-neighbor layers. Instead, monoclinic distortion of a tetragonal unit cell lifts the macroscopic degeneracy to induce a 3D charge ordering. The dimensionality of the charge order in La$_{0.5}$Sr$_{1.5}$MnO$_4$ is discussed from this viewpoint.

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