Abstract
Magnetic characteristics of HoPd2Si2 and ErPd2Si2 with the ThCr2Si2-type crystal structure have been studied from measurements of magnetic susceptibility χ(T) and magnetization M(B) on the single crystals. The compound HoPd2Si2 orders antiferromagnetically below TN = 5.1 K with the magnetic easy direction of [110]. The [110] magnetization process is a three-step metamagnetic one; metamagnetic transitions at B1 = 0.9 T, B2 = 1.5 T and B3 = 3.4 T. The [100] process is a two-step one. Between [110] and [100], strong magnetic anisotropy is seen for high magnetic fields. ErPd2Si2 shows an antiferromagnetic behavior with the magnetic easy direction of [001] below TN=3.9 K. The χ(T) shows four anomalies, which may come from magnetic transitions, at Tmax = 5.1 K, TN = T1 = 3.9 K, T2 = 3.1 K and T3 = 2.2 K. The [001] magnetization process at 2 K is a three-step metamagnetic process; metamagnetic transitions at B1 = 0.5 T, B2 = 1.0 T and B3 = 1.3 T. In the basal plane magnetization processes, a very small metamagnetic transition is at 1.9 T. Crystalline electric field (CEF) analysis was performed, and anisotropic magnetic behaviors are explained. The magnetic data of the RPd2Si2 compound series are summarized.
Highlights
The ternary compounds, which crystallize in the tetragonal ThCr2Si2-type crystal structure, have been extensively studied for the last three decades because of their large variety of physical properties.1 A large number of these compounds show an antiferromagnetic ordering and are Isinglike systems with the easy magnetization axis of the [001] direction (c-axis)
The χ⊥ is larger than the χ//, indicating that the magnetic easy direction is a direction in the basal plane
The dependency of T N is similar to the dependency of G; T N roughly follow the de Gennes scaling, suggesting the RKKY interaction is a major role in this system
Summary
The ternary compounds, which crystallize in the tetragonal ThCr2Si2-type crystal structure, have been extensively studied for the last three decades because of their large variety of physical properties. A large number of these compounds show an antiferromagnetic ordering and are Isinglike systems with the easy magnetization axis of the [001] direction (c-axis). The ternary compounds, which crystallize in the tetragonal ThCr2Si2-type crystal structure, have been extensively studied for the last three decades because of their large variety of physical properties.. A large number of these compounds show an antiferromagnetic ordering and are Isinglike systems with the easy magnetization axis of the [001] direction (c-axis). Much less study has been made on compounds with the easy magnetization direction in the basal plane.. The behavior of magnetic moments having the basal plane anisotropy is interesting. Systematic magnetic study using single crystal compounds, changed a rare earth element R, has been planned on the compounds series RPd2Si2 which has anisotropy of easy direction in the basal plane. Magnetic measurements have been carried out on the two remaining compounds in this series, the HoPd2Si2 and ErPd2Si2 single crystal compounds.
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