Bandwidth-disorder phase diagram of half doped layered manganites

Details Bandwidth-disorder phase diagram of half doped layered manganites Bandwidth-disorder phase diagram of half doped layered manganites

2006-07-05

arxiv.org/abs/cond-mat/0607115v1

Phys. Rev. B 74, 020404(R) (2006).

Physics

Condensed Matter

Materials Science

REVTeX 4 style; 5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.74.020404

Phase diagrams in the plane of $r_A$ (the average ionic radius, related to one-electron bandwidth $W$) and $\sigma^2$ (the ionic radius variance, measuring the quenched disorder), or ``bandwidth-disorder phase diagrams'', have been established for perovskite manganites, with three-dimensional (3$D$) Mn-O network. Here we establish the intrinsic bandwidth-disorder phase diagram of half-doped layered manganites with the two-dimensional (2$D$) Mn-O network, examining in detail the ``mother state'' of the colossal magnetoresistance (CMR) phenomenon in crystals without ferromagnetic instability. The consequences of the reduced dimensionality, from 3$D$ to 2$D$, on the order-disorder phenomena in the charge-orbital sectors are also highlighted.

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