Orbital mixing and nesting in the bilayer manganites La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$

Details Orbital mixing and nesting in the bilayer manganites La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$ Orbital mixing and nesting in the bilayer manganites La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$

2008-07-20

arxiv.org/abs/0807.3162v2

Phys. Rev. Lett. 101, 236402 (2008)

Physics

Condensed Matter

Materials Science

4 pages, 5 figures, published

Scientific paper

10.1103/PhysRevLett.101.236402

A first principles study of La$_{2-2x}$Sr$_{1+2x}$Mn$_2$O$_7$ compounds for doping levels $0.3\leq x\leq 0.5$ shows that the low energy electronic structure of the majority spin carriers is determined by strong momentum dependent interactions between the Mn $e_g$ $d_{x^2-y^2}$ and $d_{3z^2-r^2}$ 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 non-trivial dependence on $x$.

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