Abstract
Electrical resistivity ρ, magnetic susceptibility χ and specific heat C of Pr(Rh1-xCox)2Zn20 for 0 ≤ x ≤ 0.89 were measured to study the mechanism of simultaneous superconducting and antiferroquadrupolar (AFQ) transitions at Tc = TQ = 0.06 K in PrRh2Zn20. A broad peak in the magnetic specific heat Cm(T) at around 13 K is reproduced as a Schottky peak by a doublet-triplet two-levels model. However, another broad peak in Cm(T) at 1 3 K indicates splitting of the doublet state by a slight distortion of Zn cages due to the Co substitution. As a consequence of the splitting, the quadrupolar degrees of freedom must be quenched. With increasing x, Tc = 0.06 K for x = 0 is suppressed below 0.04 K for x ≥ 0.10. The suppression of Tc suggests possible interplay between the superconductivity and the quadrupolar degrees of freedom.
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