Magnetization and thermal expansion measurements on the Ising magnet SmPt2Si2: Potential coexistence of spin glass and antiferromagnetic states
Magnetization and thermal expansion measurements on the Ising magnet SmPt2Si2: Potential coexistence of spin glass and antiferromagnetic states
复制标题
Ising 磁体 SmPt2Si2 的磁化和热膨胀测量：自旋玻璃和反铁磁态的潜在共存
DOI：
10.1103/physrevb.104.174418
复制
发表时间：
2021
影响因子：
3.7
通讯作者：
Aoki Yuji
中科院分区：
文献类型：
--
作者：
Tayama Takashi;Matsuda Tatsuma D.;Higashinaka Ryuji;Aoki Yuji
伊辛磁体在 5.6 K 时经历反铁磁 (AFM) 转变，但一些 Sm 离子的磁矩甚至在低于 5.6 K 时仍保持无序。在这里，我们报告了在 0.26 至 7 K 温度范围内的热膨胀、磁致伸缩和直流磁化强度的测量结果。磁化强度和热膨胀结果在温度低于 2.4 K 时显示出明显的不可逆现象。这些结果表明 Sm 离子的部分无序状态变成了下面的团簇自旋玻璃，并与 AFM 长程有序共存。然而，与传统的自旋玻璃和反铁磁性共存不同，0.26 K 的等温磁化过程显示出几乎没有剩磁的磁滞曲线。这一观察表明，团簇自旋玻璃态是一种不寻常的状态，在零场下弛豫时间很短。
The Ising magnetundergoes an antiferromagnetic (AFM) transition at= 5.6 K, but the magnetic moments of some Sm ions remain disordered even below. Here, we report the results of measurements of thermal expansion, magnetostriction, and dc magnetization ofin the temperature range from 0.26 to 7 K. The magnetization and thermal expansion results show clear irreversible phenomena at temperatures below2.4 K. These results suggest that the partially disordered state of the Sm ions becomes a cluster spin glass belowand coexists with the AFM long-range order. However, unlike the conventional coexistence of spin glass and antiferromagnetism, the isothermal magnetization process at 0.26 K shows a hysteresis curve with almost no remanent magnetization. This observation suggests that the cluster spin glass state is an unusual state with a short relaxation time at zero field.