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Electron spin resonance of YbIr2Si2 below the Kondo temperature

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.