Publications
Showing 6 results for Author: Kyle Ma
Mar, 2025
Journal
Crystal field splittings and magnetic ground state of the square-lattice antiferromagnets YbBi2ClO4 and YbBi2IO4 with Jeff = 1/2
We report on the crystal field level splitting and magnetic ground state of the 𝐽eff=1/2 square lattice antiferromagnets YbBi2ClO4 and YbBi2IO4 using powder inelastic neutron scattering (INS) and neutron diffraction measurements. Both compounds exhibit a well-isolated Γ7 doublet ground state under a tetragonal crystal field environment, confirming a robust 𝐽eff=1/2 pictu…
Dec, 2024
Journal
Magnetic properties of the quasi-XY Shastry-Sutherland magnet Er2Be2SiO7
Polycrystalline and single-crystal samples of the insulating Shastry-Sutherland compound Er2Be2SiO7 were synthesized via a solid-state reaction and the floating zone method, respectively. The crystal structure, Er single-ion anisotropy, zero-field magnetic ground state, and magnetic phase diagrams along high-symmetry crystallographic directions were investigated with bul…
Dec, 2023
Journal
CrysFieldExplorer: rapid optimization of the crystal field Hamiltonian
A new approach to the fast optimization of crystal electric field (CEF) parameters to fit experimental data is presented. This approach is implemented in a lightweight Python-based program, CrysFieldExplorer. The main novelty of the method is the development of a unique loss function, referred to as the spectrum characteristic loss (LSpectrum), which is based on the charac…
Dec, 2023
Journal
Field-induced partial disorder in a Shastry-Sutherland lattice
A 2-Q antiferromagnetic order of the ferromagnetic dimers was found below TN = 2.9 K in the Shastry-Sutherland lattice BaNd2ZnS5 by single crystal neutron diffraction. The magnetic order can be understood by the orthogonal arrangement of local Ising Nd spins, identified by polarized neutrons. A field was applied along [1 -1 0] to probe the observed metamagnetic transition…