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  • Title: Orbital mixing and nesting in the bilayer manganites La2-2xSr1+2xMn2O7.
    Author: Saniz R, Norman MR, Freeman AJ.
    Journal: Phys Rev Lett; 2008 Dec 05; 101(23):236402. PubMed ID: 19113571.
    Abstract:
    A first principles study of La2-2xSr1+2xMn2O7 compounds for doping levels 0.3 < or = x < or = 0.5 shows that the low energy electronic structure of the majority spin carriers is determined by strong momentum-dependent interactions between the Mn eg dx2-y2 and d3z2-r2 orbitals, which, in addition to an x-dependent Jahn-Teller distortion, differ in the ferromagnetic and antiferromagnetic phases. The Fermi surface exhibits nesting behavior that is reflected by peaks in the static susceptibility, whose positions as a function of momentum have a nontrivial dependence on x.
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