Collective excitations in the tetravalent lanthanide honeycomb antiferromagnet

Daum, M. J.; Ramanathan, A.; Kolesnikov, A. I.; Calder, S.; Mourigal, M.; La Pierre, H. S.

doi:10.1103/physrevb.103.l121109

Collective excitations in the tetravalent lanthanide honeycomb antiferromagnet

Journal Article · Fri Mar 12 00:00:00 EST 2021 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.103.l121109· OSTI ID:1780767

Daum, M. J. ^[1]; ^[1]; ^[2]; ^[2]; ^[1]; ^[1]

Georgia Institute of Technology, Atlanta, GA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Thermomagnetic and inelastic neutron-scattering measurements on Na₂PrO₃ are reported. This material is an antiferromagnetic honeycomb magnet based on the tetravalent lanthanide Pr⁴⁺ and has been proposed to host dominant antiferromagnetic Kitaev interactions. These measurements reveal magnetic fluctuations in Na₂PrO₃ below an energy of 2 meV as well as crystal-field excitations around 230 meV. Furthermore, the latter energy is comparable to the scale of the spin-orbit interaction and explains both the very small effective moment of around 1.0μB per Pr⁴⁺ and the difficulty to uncover any static magnetic scattering below the ordering transition at T_N= 4.6 K. By comparing the low-energy magnetic excitations in Na₂PrO₃ to those of the isostructural spin-only compound, Na₂TbO₃, a microscopic model of exchange interactions is developed that implicates dominant and surprisingly large Heisenberg exchange interactions J≈1.1(1) meV. Although antiferromagnetic Kitaev interactions with K≤0.2J cannot be excluded, the inelastic neutron-scattering data of Na₂PrO₃ is best explained with a Δ=1.22 easy-axis XXZ exchange anisotropy.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1780767

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 12 Vol. 103; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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