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We present results of high-resolution, low-temperature measurements of theHall coefficient, thermopower, and specific heat on stoichiometric YbRh2Si2.They support earlier conclusions of an electronic (Kondo-breakdown) quantumcritical point concurring with a field induced antiferromagnetic one. We alsodiscuss the detachment of the two instabilities under chemical pressure. Volumecompression/expansion (via substituting Rh by Co/Ir) results in astabilization/weakening of magnetic order. Moderate Ir substitution leads to anon-Fermi-liquid phase, in which the magnetic moments are neither ordered norscreened by the Kondo effect. The so-derived zero-temperature global phasediagram promises future studies to explore the nature of the Kondo breakdownquantum critical point without any interfering magnetism.

Break up of heavy fermions at an antiferromagnetic instability