Single crystal growth and characterization of R<sub>2</sub>Co<sub>6</sub>Al<sub>20-</sub><sub>δ</sub>(R = Gd-Tm,Y)

ORAL

Abstract

We report the single crystal growth and characterization of the ternary rare-earth based aluminides R2Co6Al20-δ (R = Gd-Tm,Y). Although earlier reports proposed a monoclinic C2/m (#12) phase with composition R2Co6Al19 [1], our single crystal X-ray diffraction results reveal that these materials adopt an orthorhombic Imma structure, with δ varying non-monotonically across the heavy rare earths (δ ≈ 0.73–0.91). In addition to structural characterization, we provide a detailed overview of the anisotropic magnetic, transport and specific heat across the series. All compounds exhibit antiferromagnetic ordering at low temperatures (ranging from 1.8K-11.8K).



[1] A.V. Morozkin et al., Journal of Solid-State Chemistry 62-74, 261 (2018)

*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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Presenters

  • Sushma Kumari

    • Ames National Laboratory

Authors

  • Sushma Kumari

    • Ames National Laboratory

  • Fernando A Garcia

    • Universidade de São Paulo

  • Juan Schmidt

    • Ames National Laboratory

  • Tyler J Slade

    • Ames National Laboratory

  • Aashish Sapkota

    • Ames National Laboratory/Iowa State University
    • Ames National Laboratory

  • Paul C Canfield

    • Iowa State University

  • Raquel A. Ribeiro

    • Iowa State University