Jahn-Teller transition in La1-xSrxMnO3 in the low-doping region (0<x≤0.1) -: art. no. 054403

We have investigated the Jahn-Teller transition in La1-xSrxMnO3 by high-temperature powder neutron diffraction in the low-doping region (0<x <= 0.1). The Jahn-Teller transition temperature which is about T-JT approximate to 750 K for stoichiometric LaMnO3 is drastically reduced on doping with Sr, becoming T-JT approximate to 475 K for x=0.10. The previously identified metrically cubic orthorhombic O phase (Pmnb) for x=0 becomes clearly (also metrically) orthorhombic for small doping x=0.05 and remains so in the doping range investigated. The Jahn-Teller transition is accompanied only by the partial reduction of the distortion of the MnO6 octahedra. From the distortion of the MnO6 octahedra we have determined the orbital mixing coefficients.