Abstract
We have synthesized single crystals of AeCo2P2 (Ae = Sr, Ba) and polycrystalline powder sample of Sr1−xBaxCo2P2, and measured their magnetic properties. SrCo2P2 shows an itinerant-electron metamagnetic transition at Hc = 600 kOe and its temperature dependent magnetic susceptibility shows characteristic two anomalies at Tmax1 = 25 and Tmax2 = 115 K, suggesting it is in the vicinity of a ferromagnetic quantum critical point. While, BaCo2P2 does not show the metamagnetic transition with the applied field up to 600 kOe, and its magnetic susceptibility shows only one anomaly corresponding to Tmax1 at 33 K. In addition, the Weiss temperature of Sr1−xBaxCo2P2, decreases to negative as x increases. These results indicate the system recede from the quantum critical point by the Ba substitution.
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