title: Jahn-Teller distortion relaxation across the LaMnO3+Δ phase diagram.
abstract: The evolution of the local Jahn-Teller distortion across the LaMnO3+Δ phase diagram was obtained using the perturbed angular correlation local probe technique. We found that upon doping, the local distortion decreases continuously with increasing doping and that no fully Jahn-Teller distorted Mn(3+)O6 octahedra are observed within the orthorhombic insulating phase. A local single-phase scenario is established for the orbital disordered orthorhombic crystallographic structure. We also show that the continuous weakening of the Jahn-Teller distortions is not limited to a single-phase environment and occurs in a similar manner within an undistorted rhombohedric matrix upon lowering the temperature.
authors.affiliation: Centro de Física Nuclear, Universidade de Lisboa, Avenida Professor Gama Pinto, 2, 1649-003, Lisboa, Portugal.
authors.forename: A M L
authors.initials: AM
authors.lastname: Lopes
authors.forename: V S
authors.initials: VS
authors.lastname: Amaral
authors.forename: J G
authors.initials: JG
authors.lastname: Correia
authors.forename: J P
authors.initials: JP
authors.lastname: Araújo