Abstract
Neutron diffraction measurements were carried out on single crystals and powders of Yb2Pt2Pb, where Yb moments form two interpenetrating planar sublattices of orthogonal dimers, a geometry known as Shastry-Sutherland lattice, and are stacked along the c axis in a ladder geometry. Yb2Pt2Pb orders antiferromagnetically at TN=2.07K, and the magnetic structure determined from these measurements features the interleaving of two orthogonal sublattices into a 5×5×1 magnetic supercell that is based on stripes with moments perpendicular to the dimer bonds, which are along (110) and (-110). Magnetic fields applied along (110) or (-110) 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 that is supported by point charge calculations. Specific heat, magnetic susceptibility, and electrical resistivity measurements concur with neutron elastic scattering results that the longitudinal critical fluctuations are gapped with ΔE≃0.07meV.
| Original language | English |
|---|---|
| Article number | 104419 |
| Journal | Physical Review B |
| Volume | 93 |
| Issue number | 10 |
| DOIs | |
| State | Published - Mar 22 2016 |
Funding
We acknowledge valuable discussions with T. Sakakibara. Work at Stony Brook University (W.M., L.S.W., M.S.K., T.O., J.W.S., D.M., M.C.A.) was supported by NSF-DMR-1310008. Work at BNL (M.G., I.Z., A.M. T.) and use of the NSLS were supported by Office of Basic Energy Sciences (BES), Division of Materials Sciences and Engineering, U.S. Department of Energy (DOE), under Contract No. DE-SC00112704. This work utilized facilities supported in part by the National Science Foundation under Agreement No. DMR-0944772. Research conducted at SNS was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.