Anisotropic spin-glass and magnetic behavior in single-crystalline U2PtSi3
Anisotropic spin-glass and magnetic behavior in single-crystalline U2PtSi3
复制标题
单晶 U2PtSi3 中的各向异性自旋玻璃和磁行为
DOI：
10.1016/j.jmmm.2022.169820
复制
发表时间：
2022
影响因子：
2.7
通讯作者：
Aoki D.
中科院分区：
文献类型：
--
作者：
Li D.X.;Shimizu Y.;Nakamura A.;Sato Y.J.;Homma Y.;Honda F.;Aoki D.
报告了对六方AlB 2 型单晶U 2 PtSi 3 进行的交流和直流磁化率、磁化强度、磁弛豫、电阻率和比热测量的结果。先前报道的多晶U 2 PtSi 3 中的自旋玻璃化转变也被证实也发生在自旋冷冻温度T f = 12.4 K的单晶样品中。新发现沿和垂直于六方c轴测量的U 2 PtSi 3 的自旋玻璃效应和磁行为表现出不同的磁场响应。沿难磁化轴（c轴），T f 随磁场的变化率和检测到的磁粘系数均远小于c平面中获得的结果。另一方面，低温比热测量产生了线性温度项的增强系数，并且电阻率的温度依赖性说明了在远大于T f 的温度处的浅最小值。通过与其他三元 2:1:3 铀金属间化合物中观察到的相应性能进行比较，讨论了这些现象的可能机制。
The results of ac and dc susceptibilities, magnetization, magnetic relaxation, electrical resistivity, and specific heat measurements performed on a hexagonal AlB 2-type single-crystalline U 2 PtSi 3 are reported. The previously reported spin-glass transition in polycrystalline U 2 PtSi 3 was confirmed to also occur in the single-crystalline sample with spin freezing temperature T f= 12.4 K. It is newly found that the spin-glass effect and magnetic behavior of U 2 PtSi 3 measured along and perpendicular to the hexagonal c-axis show different magnetic field responses. Along the hard magnetization axis (c-axis), both the rate of change of T f with the magnetic field and the detected magnetic viscosity coefficient are much smaller than those obtained in the c-plane. On the other hand, the low-temperature specific heat measurement yields an enhanced coefficient of the linear temperature term, and the temperature dependence of electrical resistivity illustrates a shallow minimum at the temperature much larger than T f. The possible mechanisms for these phenomena are discussed by comparing with the corresponding properties observed in other ternary 2: 1: 3 uranium intermetallic compounds.