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We present the growth and basic magnetic and transport properties ofCr$_{1+x}$Pt$_{5-x}$P. We show that single crystals can readily be grown from ahigh-temperature solution created by adding dilute quantities of Cr to Pt-Pbased melts. Like other 1-5-1 compounds, Cr$_{1+x}$Pt$_{5-x}$P adopts atetragonal P4/mmm structure composed face-sharing CrPt$_3$ like slabs that arebroken up along the c-axis by sheets of P atoms. EDS and X-ray diffractionmeasurements both suggest Cr$_{1+x}$Pt$_{5-x}$P has mixed occupancy between Crand Pt atoms, similar to what is found in the closely related compoundCrPt$_3$, giving real compositions of Cr$_{1.5}$Pt$_{4.5}$P (x = 0.5). Wereport that Cr$_{1.5}$Pt$_{4.5}$P orders ferromagnetically at T$_C$ = 464.5 Kwith a saturated moment of $\approx$ 2.1 $\mu_{\textit{B}}$/Cr at 1.8 K. Likelyowing to the strong spin-orbit coupling associated with the large quantity ofhigh Z Pt atoms, Cr$_{1.5}$Pt$_{4.5}$P has exceptionally strong planaranisotropy with estimated anisotropy fields of 345 kOe and 220 kOe at 1.8 K and300 K respectively. The resistance of Cr$_{1.5}$Pt$_{4.5}$P has a metallictemperature dependence with relatively weak magnetoresistance. Electronic bandstructure calculations show that CrPt$_5$P has a large peak in the density ofstates near the Fermi level which is split into spin majority and minoritybands in the ferromagnetic state. Furthermore, the calculations suggestsubstantial hybridization between Cr-3d and Pt-5d states near the Fermi level,in agreement with the experimentally measured anisotropy.

High Temperature Ferromagnetism in Cr$_{1+x}$Pt$_{5-x}$P