Heterogeneous Yb3+-Yb2+ mixed valency and unusual Kondo ground state in Yb4As3

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Abstract
We present 17OYb Mdssbauer spectroscopy data in the temperature range 0.04550 K and magnetic susceptibility and isothermal magnetisation measurements in the temperature range 0.6-50 K in the heavy fermion compound Yb4As3 The presence of ~ 20% of Yb3+ ions is detected in the Mössbauer spectra with an applied magnetic field of 7 T, yielding a microscopic proof of the existence of a heterogeneous mixed valence state containing Yb3+ and Yb2+ ions. No magnetic ordering of the Yb3+ sublattice (with moments bigger than 0.15 UB) is detected down to 0.045 K. The low temperature upturn of the magnetic susceptibility is shown to be an intrinsic feature of Yb4As3, suggesting that the ground state is of an unconventional Kondo lattice type

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