Anisotropic magnetic property of single crystals RV6Sn6 (R=Y, GdTm, Lu)

Jeonghun Lee and Eundeok Mun
Phys. Rev. Materials 6, 083401 – Published 16 August 2022

Abstract

RV6Sn6 (R=Y, GdTm, Lu) single crystals are synthesized by the Sn-flux method and their physical properties are characterized by magnetization, resistivity, and specific heat measurements. Powder x-ray diffraction patterns of all samples can be well indexed with the hexagonal HfFe6Ge6-type structure, where rare-earth atoms form hexagonal layers and vanadium atoms form kagome layers. At high temperatures, magnetic susceptibility measurements of moment-bearing rare-earth ions (R=GdTm) follow Curie-Weiss behavior. Effective moments estimated from the polycrystalline average of magnetic susceptibility curves are consistent with the values for free R3+ ions. Strong magnetic anisotropy due to crystalline electric field effects is observed for moment-bearing rare-earth ions, except GdV6Sn6. The easy magnetization direction is determined to be the c axis for R=TbHo and ab plane for R=Er and Tm. The vanadium ions in RV6Sn6 possess no magnetic moment. The compounds for R=Y and Lu exhibit typical characteristics of paramagnetic metals. At low temperatures, the magnetic ordering is confirmed from magnetization, specific heat, and resistivity: the highest TN=4.9 K for GdV6Sn6 and the lowest TN=2.3 K for HoV6Sn6. No magnetic ordering is observed down to 1.8 K for R=Er and Tm. A slight deviation of the magnetic ordering temperature from the de Gennes scaling suggests the dominant Ruderman-Kittel-Kasuya-Yosida exchange interaction between rare-earth moments in metallic RV6Sn6 compounds.

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  • Received 6 June 2022
  • Accepted 2 August 2022

DOI:https://doi.org/10.1103/PhysRevMaterials.6.083401

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jeonghun Lee and Eundeok Mun

  • Department of Physics, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6

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Issue

Vol. 6, Iss. 8 — August 2022

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