Searches for direct pair production of third generation squarks with the ATLAS detector

Results of the searches for direct production of third generation squarks with the ATLAS detector are presented. The selected analyses, all updated to the full 8 TeV dataset, follow the assumptions of a Minimal Supersymmetric extension of the Standard Model of Particle Physics where the R-parity is conserved and the lightest supersymmetric particle (LSP) is the lightest Neutralino. For the hypothesis of naturallness the light partners of the top and bottom quarks should be light (< 1 TeV) and hence have a relatively high production cross section at the LHC. Since no deviations from the Standard Model predictions are observed, limits are set for different mass hierarchies and mass relations between the bottom and stop squarks and the lightest Chargino and Neutralino.