Low-temperature magnetic behaviour on the triangular lattice in hexagonal Ba$_3$Tb(BO$_3$)$_3$

Nicola Kelly; Manh Duc Le; Denis Sheptyakov; Camilla Tacconis; Cheng Liu; Gavin Stenning; Peter Baker; Siân Dutton

doi:10.1103/PhysRevB.111.054427

Low-temperature magnetic behaviour on the triangular lattice in hexagonal Ba$_3$Tb(BO$_3$)$_3$

Strongly Correlated Electrons 2025-02-21 v1

Authors: Nicola Kelly , Manh Duc Le , Denis Sheptyakov , Camilla Tacconis , Cheng Liu , Gavin Stenning , Peter Baker , Siân Dutton

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Abstract

The hexagonal polymorph of Ba $_3$ Tb(BO $_3$ ) $_3$ contains Tb $^{3+}$ ions on a quasi-2D triangular lattice, resulting in geometric magnetic frustration. Powder samples of Ba $_3$ Tb(BO $_3$ ) $_3$ have been investigated using specific heat, powder neutron diffraction (PND), inelastic neutron scattering (INS) and muon-spin relaxation spectroscopy ( $\mu$ SR). No long-range magnetic ordering is observed down to the lowest measured temperatures of 75 mK in PND and specific heat data and 1.5 K in the $\mu$ SR data. Modelling the INS spectrum using a point charge model suggests that the ground state is a singlet with a low-lying doublet on each of the two crystallographically independent Tb $^{3+}$ sites and that both the Tb ions display weak XY single-ion anisotropy.

Keywords

frustrated magnetism magnetic structure ferroelectric

Cite

@article{arxiv.2501.17052,
  title  = {Low-temperature magnetic behaviour on the triangular lattice in hexagonal Ba$_3$Tb(BO$_3$)$_3$},
  author = {Nicola Kelly and Manh Duc Le and Denis Sheptyakov and Camilla Tacconis and Cheng Liu and Gavin Stenning and Peter Baker and Siân Dutton},
  journal= {arXiv preprint arXiv:2501.17052},
  year   = {2025}
}

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22 pages, 7 figures

Low-temperature magnetic behaviour on the triangular lattice in hexagonal Ba$_3$Tb(BO$_3$)$_3$

Abstract

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