Bulk magnetic properties of distorted square lattice compounds M'-LnTaO4 (Ln = Tb, Dy, Ho, Er)

TL;DR

This study investigates the magnetic properties of lanthanide tantalates with distorted square lattices, revealing diverse magnetic behaviors and structures, including long-range antiferromagnetic order and potential short-range correlations.

Contribution

First comprehensive analysis of bulk magnetic properties and structures of M'-LnTaO4 compounds, highlighting the influence of lanthanide electronic configurations.

Findings

M'-TbTaO4 exhibits long-range AFM order below 2.1 K.

M'-DyTaO4 shows possible short-range magnetic ordering around 2.7 K.

M'-ErTaO4 has a Kramers doublet ground state similar to M'-YbTaO4.

Abstract

We report bulk magnetic properties of the monoclinic lanthanide tantalates, M'-LnTaO4 (Ln = Tb, Dy, Ho, Er), where the magnetic Ln3+ ions are arranged on a distorted 2D square lattice. The heavier analogue M'-YbTaO4 has been investigated as a spin-orbit-coupled, quasi-two-dimensional frustrated magnet, and the properties of the other M'-LnTaO4 are expected to vary depending on the electronic configuration of the Ln ion, namely Kramers vs non-Kramers behaviour and different crystal electric field parameters. In this work, powder neutron diffraction is used to confirm the crystal structure for Ln = Tb, Ho, Er, and to determine the magnetic structure of M'-TbTaO4, which displays long-range antiferromagnetic (AFM) order below T_N = 2.1 K. The Tb3+ moments are aligned primarily along the c-axis with AFM nearest-neighbour interactions. Susceptibility data suggest that M'-DyTaO4 may display short-range ordering around 2.7 K, while M'-HoTaO4 and M'-ErTaO4 show AFM correlations but do not order above 1.8 K. Measurements of the magnetic specific heat provide evidence for a Kramers doublet ground state in M'-ErTaO4, similar to its heavier analogue M'-YbTaO4.