We report an electron spin resonance (ESR) study in single crystals of the new heavy-fermion metal
YbIr2Si2
whose spin dynamics is characterized by a Kondo energy scale K and which acquires a Landau Fermi-liquid state below 0.2 K. The ESR spectra are observed well below
TK and show typical
properties of a Yb3+
resonance. This enables the direct observation of the spin dynamics and static magnetic properties
of YbIr2Si2
below the Kondo temperature.
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