Pressure-induced melting of the orbital polaron lattice in La1-xSrxMnO3

Details Pressure-induced melting of the orbital polaron lattice in La1-xSrxMnO3 Pressure-induced melting of the orbital polaron lattice in La1-xSrxMnO3

2006-03-07

arxiv.org/abs/cond-mat/0603164v1

Phys. Rev. B 73, 214432 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

7 figures

Scientific paper

10.1103/PhysRevB.73.214432

We report on the pressure effects on the orbital polaron lattice in the lightly doped manganites $\mathrm{La_{1-x}Sr_xMnO_{3}}$, with $x\sim 1/8$. The dependence of the orbital polaron lattice on $negative$ chemical pressure is studied by substituting Pr for La in $\mathrm{(La_{1-y}Pr_y)_{7/8}Sr_{1/8}MnO_{3}}$. In addition, we have studied its hydrostatic pressure dependence in $\mathrm{(La_{0.9}Pr_{0.1})_{7/8}Sr_{1/8}MnO_{3}}$. Our results strongly indicate that the hopping $t$ significantly contributes to the stabilization of the orbital polaron lattice and that the orbital polarons are ferromagnetic objects which get stabilized by local double exchange processes. The analysis of short range orbital correlations and the verification of the Grueneisen scaling by hard x-ray, specific heat and thermal expansion data reinforces our conclusions.

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