Magnetism on the stretched diamond lattice in lanthanide orthotantalates

Nicola D. Kelly; Lei Yuan; Rosalyn L. Pearson; Emmanuelle Suard; Inés Puente Orench; Siân E. Dutton

doi:10.1103/PhysRevMaterials.6.044410

Magnetism on the stretched diamond lattice in lanthanide orthotantalates

Materials Science 2022-05-06 v2 Strongly Correlated Electrons

Authors: Nicola D. Kelly , Lei Yuan , Rosalyn L. Pearson , Emmanuelle Suard , Inés Puente Orench , Siân E. Dutton

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Abstract

The magnetic Ln $^{3+}$ ions in the fergusonite and scheelite crystal structures form a distorted or stretched diamond lattice which is predicted to host exotic magnetic ground states. In this study, polycrystalline samples of the fergusonite orthotantalates $M$ -LnTaO $_4$ (Ln = Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er) are synthesized and then characterized using powder diffraction and bulk magnetometry and heat capacity. TbTaO $_4$ orders antiferromagnetically at 2.25 K into a commensurate magnetic cell with $\vec{k}=0$ , magnetic space group 14.77 ( $P2_1$ $'/c$ ) and Tb moments parallel to the $a$ -axis. No magnetic order was observed in the other materials studied, leaving open the possibility of exotic magnetic states at $T<2$ K.

Keywords

stretched diamond lattice lanthanide orthotantalates magnetic ground state fergusonite scheelite antiferromagnetic order powder diffraction

Cite

@article{arxiv.2203.01658,
  title  = {Magnetism on the stretched diamond lattice in lanthanide orthotantalates},
  author = {Nicola D. Kelly and Lei Yuan and Rosalyn L. Pearson and Emmanuelle Suard and Inés Puente Orench and Siân E. Dutton},
  journal= {arXiv preprint arXiv:2203.01658},
  year   = {2022}
}

Magnetism on the stretched diamond lattice in lanthanide orthotantalates

Abstract

Keywords

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