Magnetic Structure of Yb2Pt2Pb: Ising Moments on the Shastry-Sutherland Lattice

Published: March 22, 2016

Author(s)

W. Miiller, L. S. Wu, M. S. Kim, T. Orvis, J. W. Simonson, M. Gamza, D. M. McNally, C. S. Nelson, G. Ehlers, A. Podlesnyak, Joel Helton, Yang Zhao, Yiming Qiu, John R. Copley, Jeffrey W. Lynn, I. Zaliznyak, M. C. Aronson

Abstract

Neutron diffraction measurements were carried out on single crystals and powders of Yb2Pt2Pb, where Yb moments form planes of orthogonal dimers in the frustrated Shastry-Sutherland Lattice (SSL). Yb2Pt2Pb orders antiferromagnetically at TN=2.07 K, and the magnetic structure determined from these measurements features the interleaving of two orthogonal sublatttices into a 5x5x1 magnetic supercell that is based on stripes with moments perpendicular to the dimer bonds, which are along (110) and (-100). Magnetic fields applied along (100) or (-100) suppress the antiferromagnetic peaks from an individual sublattice, but leave the orthogonal sublattice unaffected, evidence for the Ising character of the Yb moments in Yb2Pt2Pb. Specific heat, magnetic susceptibility, and electrical resistivity measurements concur with neutron elastic scattering results that the longitudinal crtical fluctions are gapped with {Δ}Ε~).07 meV.
Citation: Physical Review B
Volume: 93
Issue: 10
Pub Type: Journals

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Keywords

Shastry-Sutherland Lattice, neutron scattering
Created March 22, 2016, Updated February 19, 2017