Electron-electron correlation determines the macroscopic properties of many “exotic” solids such as superconductors, materials exhibiting
metal-insulator transition, colossal magnetoresistance manganites, etc
The investigation of the electronic properties of such strongly correlated
electron systems with photoelectron spectroscopy (PES) is hampered by the extreme surface sensitivity of PES to be compared with a general dichotomy
between surface and bulk electronic properties in that class of materials.
PES in unconventional energy range has to be used to overcome this
limitation, obtaining an increased information depth while keeping a good energy resolution. In this way also buried layers in complex
heterostructures become accessible to investigation. Recent results from selected systems will be presented to highlight the power of the technique
to obtain information on the bulk electronic properties of solids and interfaces.
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