Results for “YbTa”

DOE OSTI2024

Structural and magnetic characterization of CeTa 7 ⁢O 19 and YbTa 7 ⁢ O 19 with a two-dimensional pseudospin-$\frac{1}{2}$ triangular lattice

Triangular lattice antiferromagnets are prototypes for frustrated magnetism and may potentially realize novel quantum magnetic states such as a quantum spin-liquid ground state. A recent work suggests NdTa 7 ⁢O 19 with rare-earth triangular lattice is a quantum spin-liquid candidate and highlights the large family of rare-earth heptatantalates as a framework for quantum magnetism investigation. Here, in this paper, we report the structural and magnetic characterization of CeTa 7 ⁢ O 19 and YbTa 7 ⁢ O 19 . Both compounds are isostructural to NdTa 7 ⁢O 19 with no detectable structural disorder. For CeTa 7 ⁢O 19 , the crystal field energy levels and parameters are determined by inelastic neutron scattering measurements. Based on the crystal field result, the magnetic susceptibility data could be well fitted and explained, which reveals that CeTa 7 ⁢O 19 is a highly anisotropic Ising triangular-lattice antiferromagnet (𝑔 𝑧 ⁡/𝑔 𝑥⁢𝑦 ∼ 3) with very weak exchange interaction (J ∼ 0.22 K). For YbTa 7⁢ O 19 , millimeter-sized single crystals could be grown. The anisotropic magnetization and electron spin resonance data show that YbTa 7⁢ O 19 has a contrasting in-plane magnetic anisotropy with 𝑔 𝑧 ⁡/𝑔 𝑥⁢𝑦 ∼ 0.67 similar as that of YbMgGaO 4 . The above results indicate that CeTa7⁢ O 19 and YbTa 7 ⁢O 19 with pseudospin-1/2 ground states might either be quantum spin-liquid candidate materials or find applications in adiabatic demagnetization refrigeration due to the weak exchange interaction.

Pan, Feihao↗

DOE OSTI2020

Materials Data on YbTa by Materials Project

YbTa crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Yb is bonded to six equivalent Yb and six equivalent Ta atoms to form YbYb6Ta6 cuboctahedra that share corners with eighteen equivalent YbYb6Ta6 cuboctahedra, edges with six equivalent YbYb6Ta6 cuboctahedra, edges with twelve equivalent TaYb6Ta6 cuboctahedra, faces with eight equivalent YbYb6Ta6 cuboctahedra, and faces with twelve equivalent TaYb6Ta6 cuboctahedra. All Yb–Yb bond lengths are 3.10 Å. All Yb–Ta bond lengths are 3.24 Å. Ta is bonded to six equivalent Yb and six equivalent Ta atoms to form TaYb6Ta6 cuboctahedra that share corners with eighteen equivalent TaYb6Ta6 cuboctahedra, edges with six equivalent TaYb6Ta6 cuboctahedra, edges with twelve equivalent YbYb6Ta6 cuboctahedra, faces with eight equivalent TaYb6Ta6 cuboctahedra, and faces with twelve equivalent YbYb6Ta6 cuboctahedra. All Ta–Ta bond lengths are 3.10 Å.

36 MATERIALS SCIENCE↗