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The localized f-electrons enrich the magnetic properties in rare-earth-basedintermetallics. Among those, compounds with heavier 4d and 5d transition metalsare even more fascinating because anomalous electronic properties may beinduced by the hybridization of 4f and itinerant conduction electrons primarilyfrom the d orbitals. Here, we describe the observation of trivalent Yb3+ with S= 1/2 at low temperatures in YbxPt5P, the first of a new family of materials.YbxPt5P (0.20< x <1) phases were synthesized and structurally characterized.They exhibit a large homogeneity width with the Yb ratio exclusively occupyingthe 1a site in the anti-CeCoIn5 structure. Moreover, the resistivitymeasurement of a sample analyzed as Yb0.25Pt5P shows it to exist a completezero-resistance transition with a critical transition temperature of ~0.6 K,possible superconductivity. However, the zero-resistivity transition was notobserved in YbPt5P with antiferromagnetic ordering existing solely.First-principles electronic structure calculations substantiate theantiferromagnetic ground state and indicate that 2D nesting around the Fermilevel may give rise to exotic physical properties, such as superconductivity.YbxPt5P appears to be a unique case among materials.

A Novel Magnetic Material by Design: Observation of Yb3+ with Spin-1/2 and Possible Superconducting Trace in YbxPt5P