| In Kondo lattice systems the quantum entanglement between localized and itinerant electronic states gives rise to the formation of heavy charge carriers. The competition of the relevant energy scales may result in the emergence of novel states of condensed matter. Here, we present recent experimental results of Scanning Tunneling Microscopy and Spectroscopy (STM/S) at low temperature conducted on the prototypical Kondo lattice compound YbRh2Si2. The topography confirms an excellent low temperature in-situ cleave of the single crystals. The hybridization of conduction band and 4f-like states results in a gap-like feature in the tunneling conductance at the Fermi level. In addition, the crystal field excitations are unambiguously reflected in our STS data and hence, bulk properties are predominatly probed. A strongly temperature dependent peak in the tunneling conductance is attributed to a resonance of the coherent Kondo-lattice state. |
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