High-field magnetization of a two dimensional spin frustration system Ni$_{5}$(TeO$_{3}$)$_{4}$X$_{2}$ (X = Br and Cl)

TL;DR

This study investigates the high-field magnetization behavior of Ni-based two-dimensional frustrated spin systems with kagome structure, revealing step-like transitions at specific fields and suggesting potential higher-field transitions.

Contribution

First detailed high-field magnetization measurements on Ni$_{5}$(TeO$_{3}$)$_{4}$X$_{2}$ compounds, providing new insights into their spin-flop transitions and high-field magnetic behavior.

Findings

Observed step-like transitions at ~10-11 T below T_N

Magnetization increases monotonically up to 55 T above T_N

No evidence of further transitions up to 55 T

Abstract

High-field magnetization, M($H$), on Ni$_{5}$(TeO$_{3}$)$_{4}$X$_{2}$ (X = Br and Cl) were measured by using a pulse magnet. These compounds have a two dimensional crystal structure and a distorted kagome spin frustrated system which is builded by the Ni$^{2+}$ ions ($\textbf{S}$ = 1). The N\'eel transition temperatures are $T_{N} \sim$ 28 and 23 K for X = Br and Cl, respectively. When $T < T_{N}$, we observed a step-like transition at $H_{c} \sim$ 11 and 10 T for X = Br and Cl, respectively. On the other hand, at $T > T_{N}$, the field-dependent magnetization curves behaved like a monotonically increasing straight line up to 55 T. The $H_{c}$ value is close to those obtained by previous spin resonance studies in which a model of spin-flop scenario was proposed to explain the field-dependent resonance spectra. Their model predicts a further transition at around 23 T, however, our observations did not show any plateau behaviors, saturation or other anomalies up to 55 T, suggesting that the further transition possibly exists at a much higher field region.