Pseudogap Formation in Models for Manganites

Details Pseudogap Formation in Models for Manganites Pseudogap Formation in Models for Manganites

1999-04-28

arxiv.org/abs/cond-mat/9904416v2

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted for publication in Phys. Rev. Lett., 4 pages, Revtex, with 4 figures embedded

Scientific paper

10.1103/PhysRevLett.83.2773

The density-of-states (DOS) and one-particle spectral function $\rm A({\bf k}, \omega)$ of the one- and two-orbital models for manganites, the latter with Jahn-Teller phonons, are evaluated using Monte Carlo techniques. Unexpectedly robust pseudogap (PG) features were found at low- and intermediate-temperatures, particularly at or near regimes where phase-separation occurs as $\rm T$$\to$0. The PG follows the chemical potential and it is caused by the formation of ferromagnetic metallic clusters in an insulating background. It is argued that PG formation should be generic of mixed-phase regimes. The results are in good agreement with recent photoemission experiments for $\rm La_{1.2} Sr_{1.8} Mn_2 O_7$.

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