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Cluster glass transition in the ternary Dy2AgIn3 system determined by Neutron Diffraction and Ac - Dc Magnetization Measurements
Journal of Magnetism and Magnetic Materials ( IF 2.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.jmmm.2020.167123
I.M. Siouris , S. Katsavounis , V. Kontopou , A. Hoser , R.K. Kremer

Abstract The crystallographic and magnetic properties of the polycrystalline intermetallic compound D y 2 A g I n 3 are presented. The compound crystallizes in the hexagonal CaI n 2 - type structure (space group P 6 3 / m m c ). The magnetic susceptibility data reveals a Curie–Weiss (CW) law behavior above 120 K , with a calculated effective magnetic moment μ eff = 10.63 ± 0.29 μ B / D y 3 + and a Curie paramagnetic temperature θ p = 17.5 K ± 0.5 K , demonstrating the dominance of ferromagnetic (FM) couplings in the sample. In the temperature range of 60 - 120 K it exhibits a Griffith’s phase like behavior. The dc field cooled (FC) and zero field cooled (ZFC) susceptibility, show field dependent irreversible phenomena below T r ~ 43 K , and the ZFC plots present a cusp glass like maxima at 31 K . The irreversibility temperature T r adopts a H 2 / 3 , field dependence of de Almeida–Thouless type line which defines the stability limits in the H-T plane with T r ( 0 ) = 44.5 ± 0.5 K . The ac susceptibility data shows a relative shift in freezing temperature δ T f ~ 0.048 ± 0.004 , while near the freezing temperature it exhibits a Power- Vogel-Fulcher law dependency characterized by the dynamic exponents z ν = 7.4 , single flip time τ 0 = 10 - 6 s and T g = 24.5 ± 0.65 K . These values suggest the formation of cluster spin-glass states (CSG). At low angles the neutron diffraction (ND) profiles display diffuse scattering of antiferromagnetic (AFM) origin which is triggered by the ~ 5 n m - magnetic spin clusters.

中文翻译:

通过中子衍射和交流-直流磁化测量确定的三元 Dy2AgIn3 系统中的簇玻璃化转变

摘要 介绍了多晶金属间化合物D y 2 A g I n 3 的晶体学和磁学性质。该化合物以六方CaI n 2 型结构(空间群P 6 3 / mmc )结晶。磁化率数据揭示了高于 120 K 的居里-魏斯 (CW) 定律行为,计算出的有效磁矩 μ eff = 10.63 ± 0.29 μ B / D y 3 + 和居里顺磁温度 θ p = 17.5 K ± 0.5 K ,证明了样品中铁磁 (FM) 耦合的优势。在 60 - 120 K 的温度范围内,它表现出类似格里菲斯相的行为。直流场冷却 (FC) 和零场冷却 (ZFC) 磁化率在 T r ~ 43 K 以下显示场相关的不可逆现象,ZFC 图在 31 K 处呈现像尖峰玻璃一样的最大值。不可逆温度 T r 采用 H 2 / 3 ,de Almeida-Thouless 型线的场相关性,它定义了 HT 平面中的稳定性极限,其中 T r ( 0 ) = 44.5 ± 0.5 K。交流磁化率数据显示冷冻温度 δ T f ~ 0.048 ± 0.004 的相对偏移,而在接近冷冻温度时,它表现出 Power-Vogel-Fulcher 定律依赖性,其特征在于动态指数 z ν = 7.4,单翻转时间 τ 0 = 10 - 6 秒和 T g = 24.5 ± 0.65 K。这些值表明簇自旋玻璃态 (CSG) 的形成。在低角度下,中子衍射 (ND) 剖面显示反铁磁 (AFM) 起源的漫散射,这是由 ~ 5 nm - 磁性自旋簇触发的。5 千。交流磁化率数据显示冷冻温度 δ T f ~ 0.048 ± 0.004 的相对偏移,而在接近冷冻温度时,它表现出 Power-Vogel-Fulcher 定律依赖性,其特征在于动态指数 z ν = 7.4,单翻转时间 τ 0 = 10 - 6 秒和 T g = 24.5 ± 0.65 K。这些值表明簇自旋玻璃态 (CSG) 的形成。在低角度下,中子衍射 (ND) 剖面显示反铁磁 (AFM) 起源的漫散射,这是由 ~ 5 nm - 磁性自旋簇触发的。5 千。交流磁化率数据显示冷冻温度 δ T f ~ 0.048 ± 0.004 的相对偏移,而在接近冷冻温度时,它表现出 Power-Vogel-Fulcher 定律依赖性,其特征在于动态指数 z ν = 7.4,单翻转时间 τ 0 = 10 - 6 秒和 T g = 24.5 ± 0.65 K。这些值表明簇自旋玻璃态 (CSG) 的形成。在低角度下,中子衍射 (ND) 剖面显示反铁磁 (AFM) 起源的漫散射,这是由 ~ 5 nm - 磁性自旋簇触发的。这些值表明簇自旋玻璃态 (CSG) 的形成。在低角度下,中子衍射 (ND) 剖面显示反铁磁 (AFM) 起源的漫散射,这是由 ~ 5 nm - 磁性自旋簇触发的。这些值表明簇自旋玻璃态 (CSG) 的形成。在低角度下,中子衍射 (ND) 剖面显示反铁磁 (AFM) 起源的漫散射,这是由 ~ 5 nm - 磁性自旋簇触发的。
更新日期:2020-11-01
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