Yb${}_2$Pt${}_2$Pb: Magnetic frustration in the Shastry-Sutherland lattice

Abstract

We have synthesized single crystals of Yb${}_2$Pt${}_2$Pb, which crystallize in the layered U${}_2$Pt${}_2$Sn-type structure, where planes of Yb ions lie on a triangular network. We report here the first results of magnetization, specific heat, and electrical resistivity experiments. The lattice constants and high temperature magnetic susceptibility indicate that the Yb ions are trivalent, while Schottky peaks in the specific heat show that the ground state is a well isolated doublet. Significant magnetic anisotropy is observed, with the ratio of susceptibilities perpendicular and parallel to the magnetic planes differing by as much as a factor of 30 at the lowest temperatures. Antiferromagnetic order occurs at a Néel temperature $T_{\mathrm{N}}$=2.07 K, a transition temperature which is more than an order of magnitude smaller than the mean field interactions reflected by the in-plane Weiss temperature. Further evidence for short ranged magnetic fluctuations is found in the magnetic susceptibility and electrical resistivity, which have broad peaks above $T_{\mathrm{N}}$, and in the slow development of the magnetic entropy at $T_{\mathrm{N}}$. Our experiments indicate that Yb${}_2$Pt${}_2$Pb is a quasi-two dimensional and localized moment system, where strong magnetic frustration may arise from the geometry of the underlying Shastry-Sutherland lattice.

8 pages, 8 figures

References in corpus (1)

• Variational treatment of the Shastry-Sutherland antiferromagnet using Projected Entangled Pair States (PEPS)

Cited by in corpus (8)

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• Dimer-induced heavy-fermion superconductivity in the Shastry-Sutherland Kondo lattice model
• Magnetic phases in the S=1 Shastry-Sutherland model with uniaxial anisotropy
• Insulator-metal transition and quasi-flat-band of Shastry-Sutherland lattice
• Spin nematic order and superconductivity in $J_1$-$J_2$ Kondo lattice model on square lattice