Physical properties of quaternary compounds Gd2CoAl4T2 (T = Si, Ge) single crystals

Abstract

We have synthesized and investigated physical properties of two new quaternary compounds Gd2CoAl4T2 (T = Si, Ge) single crystals, which are isostructural to Tb2NiAl4Ge2 and Er2CoAl4Ge2. The most important structural feature of these materials is the anti-CaF2-type CoAl4T2 slabs. These materials show metallic behavior below 300 K and there is a long-range antiferromagnetic (AFM) transition appearing at 20 and 27 K for Gd2CoAl4Ge2 and Gd2CoAl4Si2, respectively. Resistivity and heat capacity measurements also confirm these bulk AFM transitions. Further analysis indicates that this long-range antiferromagnetism should result from the magnetic interaction between local moments of Gd3+ ions.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11574394, 11774423, 11822412, and 51608273), the Fundamental Research Funds for the Central Universities (Grant No. 2017RC20), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 16KJB560008), the Young Researcher Program Nanjing Forestry University of China (No. CX2016023), Key Laboratory of Advanced Building Materials of Anhui Province of China (No. JZCL201603KF), and State Key Laboratory of High Performance Civil Engineering Materials of China (No. 2016CEM004).

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Correspondence to Xiao Zhang or Hechang Lei.

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Huang, K., Sun, Y., Sun, S. et al. Physical properties of quaternary compounds Gd2CoAl4T2 (T = Si, Ge) single crystals. Front. Phys. 14, 23502 (2019). https://doi.org/10.1007/s11467-018-0870-3

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Keywords

  • magnetic materials
  • rare earth compounds
  • single crystal growth