# Synthesis and Magnetism of a Li$_2$FeSiO$_4$ Single Crystal

## TL;DR

This study reports the growth of a high-quality single crystal of Li₂FeSiO₄ using high-pressure techniques, revealing its magnetic properties including antiferromagnetic order and quasi-low-dimensional magnetism, with field-induced anomalies.

## Contribution

First successful synthesis of Li₂FeSiO₄ single crystal via high-pressure floating-zone method and detailed magnetic characterization revealing complex magnetic behavior.

## Key findings

- Antiferromagnetic transition at 17 K
- Presence of quasi-low-dimensional magnetism
- Magnetic field induces anomalies around 14.8 T

## Abstract

A macroscopic single crystal of $\gamma_{\rm II}$-Li\(_2\)FeSiO\(_4\) has been grown by means of the high-pressure optical floating-zone technique. Static magnetic susceptibility $\chi$ implies that the tetrahedrally-coordinated Fe$^{2+}$ ions are in the high-spin, $S=2$, state. While a sharp decrease in $\chi$ implies long-range antiferromagnetic order below \tn\ = 17.0(5)~K, the presence of a broad maximum at $T_{\rm m} = 28$~K suggests quasi-low-dimensional magnetism. Applying magnetic fields along the easy magnetic $a$-axis yields additional contributions to the susceptibility $\partial M/\partial B$ and magnetostriction for $B > 7$~T, and an anomaly at $B\approx 14.8$~T.