# Controlling the stoichiometry of the triangular lattice antiferromagnet Li$_{1+x}$Zn$_{2-y}$Mo$_3$O$_8$

## TL;DR

This study achieved precise control of the stoichiometry in Li$_{1+x}$Zn$_{2-y}$Mo$_3$O$_8$, revealing that improved chemical composition enhances understanding of its magnetic properties and antiferromagnetic correlations.

## Contribution

The paper demonstrates a method to control and improve the stoichiometry of Li$_{1+x}$Zn$_{2-y}$Mo$_3$O$_8$ using solid-state reactions, leading to better structural and magnetic characterization.

## Key findings

- Optimized synthesis yields near-ideal stoichiometry.
- Structural analysis shows preferential Li occupation and reduced secondary phases.
- Magnetic susceptibility indicates inherent antiferromagnetic correlations.

## Abstract

The control of the stoichiometry of Li$_{1+x}$Zn$_{2-y}$Mo$_3$O$_8$ was achieved by the solid-state-reaction. We found that the best sample that has the chemical composition Li$_{0.95(4)}$Zn$_{1.92(8)}$Mo$_3$O$_8$ was obtained from the starting nominal composition with Li : Zn : Mo : O = $(1+w)$ : $(2.8-w)$ : $3$ : $8.6$ with $w = -0.1$, indicating that the stoichiometry is greatly improved compared to those in the earlier reports. For larger $w$ detailed structural analysis indicates that the mixed sites of Li and Zn are preferentially occupied by Li atoms, as well as the fraction of the non-magnetic secondary phase Zn$_2$Mo$_3$O$_8$ decreases. Magnetic susceptibility of the improved stoichiometry powder samples shows a broad hump in the temperature range of 100 $< T <$ 200 K. This suggests that the development of antiferromagnetic correlations at the high temperatures is inherent to the ideal stoichiometric LiZn$_2$Mo$_3$O$_8$.