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The delicate balance of spin-screening and spin-aligning interactionsdetermines many of the peculiar properties of dilute magnetic systems. We studya surface-supported all-organic multi-impurity Kondo spin system at the atomicscale by low-temperature scanning tunnelling microscopy and -spectroscopy. Themodel system consists of spin-1/2 radicals that are aligned in one-dimensionalchains and interact via a ferromagnetic RKKY interaction mediated by the 2DEGof the supporting substrate. Due to the RKKY-induced enhanced depopulation ofone spin-subband in the 2DEG, we finally succeeded to detect the so farunobserved 'Kondo state' as opposed to the well-established Kondo resonance.Its cloud of screening electrons, that are virtually bound to the radicalsbelow the Kondo temperature, represents the extended exchange hole of theferromagnetically polarized spin chain imaged here in real space.

'Kondo state' and Kondo resonance in a two-dimensional electron gas