Abstract
The magnetic behavior and possibility of quantum criticality in a (Cr0.98Si0.02)1−yMoy alloy system (0 ≤ y ≤ 0.09) is investigated through electrical resistivity, specific heat, and thermoelectric power measurements in a temperature range 2–350 K. Alloys with 0 ≤ y ≤ 0.011 depict first-order Néel transitions that give way to continuous Néel transitions for 0.011 < y ≤ 0.038. The Néel temperature, TN(y), seems to be suppressed down to 0 K at a critical concentration yc ≈ 0.04. The Sommerfeld coefficient of specific heat γ(y) peaks at y ≈ yc, showing a sharp decreasing trend on decreasing y to below yc. This behavior is reminiscent of that observed for γ of the prototypical Cr1−xVx quantum critical system, and indeed also portrays the physics of a quantum critical point in the present (Cr0.98Si0.02)1−yMoy system.
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