Torque magnetometry study of metamagnetic transitions in single-crystal HoNi2B2C at T\approx 1.9 K

TL;DR

This study uses torque magnetometry to explore the complex metamagnetic phase transitions in single-crystal HoNi2B2C at low temperature, revealing new phase boundaries and detailed magnetization directions.

Contribution

It provides the first detailed angular and field-dependent measurements of metamagnetic transitions in HoNi2B2C, identifying new phase boundaries and magnetization orientations.

Findings

Discovered two new phase boundaries in the non-collinear phase region.

Precisely determined the magnetization direction in the non-collinear phase.

Observed multidomain antiferromagnetic phase at low fields.

Abstract

Metamagnetic transitions in single-crystal rare-earth nickel borocarbide HoNi$_2$B$_2$C have been studied at T\approx 1.9 K with a Quantum Design torque magnetometer. This compound is highly anisotropic with a variety of metamagnetic states at low temperature which includes antiferromagnetic, ferrimagnetic, non-collinear and ferromagnetic-like (saturated paramagnet) states. The critical fields of the transitions depend crucially on the angle $\theta$ between applied field and the easy axis [110]. Measurements of torque along the c-axis have been made while changing the angular direction of the magnetic field (parallel to basal tetragonal $ab$-planes) and with changing field at fixed angle over a wide angular range. Two new phase boundaries in the region of the non-collinear phase have been observed, and the direction of the magnetization in this phase has been precisely determined. At low field the antiferromagnetic phase is observed to be multidomain. In the angular range very close to the hard axis [100] ($-6^{\circ} \lesssim\phi \lesssim 6^{\circ}$, where $\phi$ is the angle between field and the hard axis) the magnetic behavior is found to be ``frustrated'' with a mixture of phases with different directions of the magnetization.