Neutron scattering measurement of crystalline-electric fields in magnesium rare-earth selenide spinels

Reig-i-Plessis, D.; Cote, A.; van Geldern, S.; Mayrhofer, R. D.; Aczel, Adam A.; MacDougall, G. J.

doi:10.1103/PhysRevMaterials.3.114408

Title: Neutron scattering measurement of crystalline-electric fields in magnesium rare-earth selenide spinels

Journal Article · Tue Nov 12 00:00:00 EST 2019 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.3.114408· OSTI ID:1607070

Reig-i-Plessis, D. ^[1]; Cote, A. ^[1]; van Geldern, S. ^[1]; Mayrhofer, R. D. ^[2];

^[3];

^[1]

Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Univ. of Rochester, NY (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

The symmetry of local moments plays a defining role in the nature of exotic ground states stabilized in frustrated magnetic materials. Here, we present inelastic neutron scattering (INS) measurements of the crystal electric field (CEF) excitations in the family of compounds $Mg R_{2} {Se}_{4}$ $(R ϵ {Ho, Tm, Yb})$ . These compounds form in the spinel structure, with the rare-earth ions comprising a highly frustrated pyrochlore sublattice. Within the symmetry constraints of this lattice, we fit both the energies and intensities of observed transitions in the INS spectra to determine the most likely CEF Hamiltonian for each material and comment on the ground-state wavefunctions in the local electron picture. In this way, we experimentally confirm ${MgTm}_{2} {Se}_{4}$ has a nonmagnetic ground state, and ${MgYb}_{2} {Se}_{4}$ has effective $S = \frac{1}{2}$ spins with $g_{∥} = 5.188 (79)$ and $g_{⊥} = 0.923 (85)$ . The spectrum of ${MgHo}_{2} {Se}_{4}$ indicates a ground-state doublet containing Ising spins with $g_{∥} = 2.72 (46)$ , though low-lying CEF levels are also seen at thermally accessible energies $E = 0.591 (36)$ , 0.945(30), and 2.88(7) meV, which can complicate interpretation. These results are used to comment on measured magnetization data of all compounds and are compared to published results on the material ${MgEr}_{2} {Se}_{4}$ .

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; DMR-1455264-CAR; 1659598

OSTI ID:: 1607070

Journal Information:: Physical Review Materials, Vol. 3, Issue 11; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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