Abstract
We present first specific-heat data of the alloy Yb(Rh1−xCox)2Si2 at intermediate Co-contents x = 0.18, 0.27, and 0.68. The results already point to a complex magnetic phase diagram as a function of composition. Co-doping of YbRh2Si2 (Tx = 0N = 72 mK) stabilizes the magnetic phase due to the volume decrease of the crystallographic unit cell. The magnetic phase transitions are clearly visible as pronounced anomalies in C4f(T)/T and can be suppressed by applying a magnetic field. Going from x = 0.18 to x = 0.27 we observe a change from two mean-field (MF) like magnetic transitions at T0.18N = 1.1K and T0.18L = 0.65 K to one sharp λ-type transition at T0.27N = 1.3 K. Preliminary measurements under magnetic field do not confirm the field-induced first-order transition suggested in the literature. For x = 0.68 we find two transitions at T0.68N = 1.14 K and T0.68L = 1.06 K.
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