High-field magnetization of a two dimensional spin frustration system Ni₅(TeO₃)₄X₂ (X = Br and Cl)

Original · EN

High-field magnetization, M(H), on Ni₅(TeO₃)₄X₂ (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 Ni²⁺ ions (S = 1). The Néel transition temperatures are Tₙ 28 and 23 K for X = Br and Cl, respectively. When T < Tₙ, we observed a step-like transition at Hc 11 and 10 T for X = Br and Cl, respectively. On the other hand, at T > Tₙ, the field-dependent magnetization curves behaved like a monotonically increasing straight line up to 55 T. The Hc 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.