274 citations · 3.3k across the 96 of their papers we have counts for
5 papers · 1 filter
Jahn-Teller mechanism of stripe formation in doped layered LaSrNiO nickelates
Krzysztof Rościszewski, Andrzej M. Oleś
We introduce an effective model for electrons to describe quasi-two-dimensional layered LaSrNiO nickelates and study it using correlated wave functions on $…
Dimensional crossover and the magnetic transition in electron doped manganites
Andrzej M. Oles, Giniyat Khaliullin
We introduce a microscopic model for electron doped manganites that explains the mechanism of the observed transition from -type antiferromagnetic (-AF) to -type antiferro…
Valence Bond Crystal and possible orbital pinball liquid in a t2g model
Fabien Trousselet, Arnaud Ralko, Andrzej M. Oles
We study a model for orbitally degenerate Mott insulators, where localized electrons possess t_2g degrees of freedom coupled by several, competing, exchange mechanisms. We provide…
Spin-orbital physics for p orbitals in alkali RO_2 hyperoxides --- generalization of the Goodenough-Kanamori rules
Krzysztof Wohlfeld, Maria Daghofer, Andrzej M. Oles
We derive a realistic spin-orbital model at finite Hund's exchange for alkali hyperoxides. We find that, due to the geometric frustration of the oxygen lattice, spin and orbital wa…
Competing Pairing Symmetries in a Generalized Two-Orbital Model for the Pnictides
Andrew Nicholson, Weihao Ge, Xiaotian Zhang +6
We introduce and study an extended "t-U-J" two-orbital model for the pnictides that includes Heisenberg terms deduced from the strong coupling expansion. Including these J terms ex…