Orbital ordering in the layered manganites

TL;DRAbstract

The interaction between the long range correlations of electrons and the encompassing crystal structure is a key aspect of solid state physics. This thesis studies the long range interactions of the 3D orbitals in the single and bilayered manganites. Orbital ordering and the omnipresent Jahu-Teller distortions appear at low temperatures ill these samples, accompanied by a real-space charge order. The results display different aspects of these long range order phenomena ill Lao.5Sr1.5nO4, Nd1_xSr1+xMn04 where 0.66 >x >0.8, and La2_2x:Sr1+2xMn207where 0.5 > x > 0.7 using different techniques of x-ray diffraction. High energy x-ray diffraction is optimised to detect structural aspects ill materials, and as Audi is sensitive to the Jalm-Teller distortions. Resonant scattering at the Mil к edge is used to study both the structural and the more specific charge and orbital ordering. Finally, soft x-ray resonant diffraction at the Mn L edge is used as a specialised technique for l

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