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All sourcesNASA NTRSDOE OSTI
DOE OSTI2023

Structure and properties of NdCuGa 3 single crystals

Here this manuscript reports on the structural and magnetic properties of NdCuGa 3 using powder and single crystal X-ray diffraction (XRD), zero-field single crystal neutron diffraction, magnetization, and specific heat measurements. Our XRD on a single crystal specimen of NdCuGa3 confirmed that it crystallizes in the tetragonal BaNiSi 3 -type structure. A magnetic phase transition at T N = 3.3 K is assessed using specific heat and ac magnetic susceptibility measurements. No additional anomaly below T N down to 50 mK was detected by performing specific heat measurements. Neutron single crystal diffraction data collected at T = 300 mK confirm the antiferromagnetic phase below T N = 3.3 K with the propagation vector $\vec{\tau}$ = (0.2, 0, 0). Possible magnetic structure solutions of NdCuGa 3 are discussed

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on NdGa3Cu by Materials Project

NdCuGa3 crystallizes in the tetragonal I-4m2 space group. The structure is three-dimensional. Nd is bonded in a 8-coordinate geometry to four equivalent Cu and twelve Ga atoms. All Nd–Cu bond lengths are 3.38 Å. There are eight shorter (3.22 Å) and four longer (3.38 Å) Nd–Ga bond lengths. Cu is bonded to four equivalent Nd and eight Ga atoms to form distorted CuNd4Ga8 cuboctahedra that share corners with four equivalent GaNd4Ga4Cu4 cuboctahedra, corners with twelve equivalent CuNd4Ga8 cuboctahedra, edges with two equivalent GaNd4Ga4Cu4 cuboctahedra, faces with four equivalent CuNd4Ga8 cuboctahedra, and faces with four equivalent GaNd4Ga4Cu4 cuboctahedra. There are four shorter (2.53 Å) and four longer (2.97 Å) Cu–Ga bond lengths. There are two inequivalent Ga sites. In the first Ga site, Ga is bonded in a 9-coordinate geometry to four equivalent Nd, two equivalent Cu, and three Ga atoms. There are one shorter (2.49 Å) and two longer (2.53 Å) Ga–Ga bond lengths. In the second Ga site, Ga is bonded to four equivalent Nd, four equivalent Cu, and four equivalent Ga atoms to form GaNd4Ga4Cu4 cuboctahedra that share corners with four equivalent CuNd4Ga8 cuboctahedra, corners with twelve equivalent GaNd4Ga4Cu4 cuboctahedra, edges with two equivalent CuNd4Ga8 cuboctahedra, faces with four equivalent CuNd4Ga8 cuboctahedra, and faces with four equivalent GaNd4Ga4Cu4 cuboctahedra.

36 MATERIALS SCIENCE↗