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We describe the crystal structure and elementary magnetic properties of apreviously unreported ternary intermetallic compound, Cr4PtGa17, whichcrystallizes in a rhombohedral unit cell in the noncentrosymmetric space groupR3m. The crystal structure is closely related to those of XYZ half-Heuslercompounds, where X, Y and Z are reported to be single elements only, occupyingthree different face-centered cubic sublattices. The new material, Cr4PtGa17,can be most straightforwardly illustrated by writing the formula as(PtGa2)(Cr4Ga14)Ga (X=PtGa2, Y = Cr4Ga14, Z = Ga), that is, the X and Y sitesare occupied by clusters instead of single elements. The magnetic Cr occupies abreathing pyrochlore lattice. Ferromagnetic ordering is found below TC ~61 K,by both neutron diffraction and magnetometer studies, with a small, saturatedmoment of ~0.25 muB/Cr observed at 2 K, making Cr4PtGa17 the firstferromagnetically ordered material with a breathing pyrochlore lattice. Amagnetoresistance of ~140% was observed at 2 K. DFT calculations suggest thatthe material has a nearly-half-metallic electronic structure. The new material,Cr4PtGa17, the first realization of both a half-Heusler-type structure and abreathing pyrochlore lattice, might pave a new way to achieve novel types ofhalf-Heusler compounds.

Ferromagnetic Cr4PtGa17: A Novel Half-Heusler-Type Compound with a Breathing Pyrochlore Lattice