Single crystal growth and characterization of R2Co6Al19 (R=Gd-Tm)

R₂Co₆Al₁₉ (R=rare earth) adopts a monoclinic structure (C2/m) featuring quasi-1D chains of the rare earth atoms. Prior work has characterized polycrystalline samples with the light R atoms (R = Ce, Pr) [1,2]; however, no data is reported on single crystals, and analogues with the heavy R’s are yet to be isolated. Here, we report the synthesis and discovery of the heavy R (R = Gd-Tm) members of the R₂Co₆Al₁₉ family, and outline the growth of single crystals from an Al-rich ternary melt. We use x-ray diffraction, temperature and field dependent magnetization, transport, and heat capacity measurements to provide a comprehensive overview of the evolution of the anisotropic physical properties and magnetic phases of this series as function of the rare earth cation.

[1] O. Tougait et al., Journal of Solid-State Chemistry 178, 3639 (2005).

[2] D. Kaczorowski et al., J. Magn. Magn. Mater. 272–276, 239 (2004).

*This work is supported by the U.S. Department of Energy (U.S. DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering. Ames National Laboratory is operated for the U.S. DOE by Iowa State University under Contract No. DE-AC02-07CH11358.

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Bulletin of the American Physical Society

2024 APS March Meeting

Monday–Friday, March 4–8, 2024; Minneapolis & Virtual

Session K21: Emergent Properties: Synthesis and Interfacial Effects

Abstract: K21.00012 : Single crystal growth and characterization of R2Co6Al19 (R=Gd-Tm)*

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Abstract: K21.00012 : Single crystal growth and characterization of R₂Co₆Al₁₉ (R=Gd-Tm)*