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Journal Article

Jahn-Teller mechanism of stripe formation in doped layered La2-xSrxNiO4 nickelates


Oleś,  A. M.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Rosciszewski, K., & Oleś, A. M. (2011). Jahn-Teller mechanism of stripe formation in doped layered La2-xSrxNiO4 nickelates. Journal of Physics: Condensed Matter, 23(26): 265601.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C09D-8
We introduce an effective model for e(g) electrons to describe quasi-two-dimensional layered La(2-x)Sr(x)NiO(4) nickelates and study it using correlated wavefunctions on 8 x 8 and 6 x 6 clusters. The effective Hamiltonian includes the kinetic energy, on-site Coulomb interactions for eg electrons (intraorbital U and Hund's exchange J(H)) and the coupling between eg electrons and Jahn-Teller distortions (static modes). The experimental ground state phases with inhomogeneous charge, spin and orbital order at the dopings x = 1/3 and 1/2 are reproduced very well by the model. Although the Jahn-Teller distortions are weak, we show that they play a crucial role and stabilize the observed cooperative charge, magnetic and orbital order in the form of a diagonal stripe phase at x = 1/3 doping and a chequerboard phase at x = 1/2 doping.