Spin-glass behavior in ternary uranium compound U2CuGa3
Spin-glass behavior in ternary uranium compound U2CuGa3
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DOI：
10.1016/j.jallcom.2003.11.106
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发表时间：
2004-07
影响因子：
6.2
通讯作者：
T. Yamamura;Dexin Li;K. Yubuta;Y. Shiokawa
中科院分区：
文献类型：
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作者：
T. Yamamura;Dexin Li;K. Yubuta;Y. Shiokawa
本文给出了一种早期文献报道的具有有趣磁性的化合物U{sub 2}CuGa{sub 3}的直流磁化率、磁化率、磁弛豫和比热的测量结果。在零场冷却（ZFC）模式和场冷却（FC）模式下测量的磁化率的温度依赖关系显示自旋玻璃行为低于特征温度T{f}({约}16 K)，与文献一致。作为该化合物自旋玻璃态形成的新证据，比热数据在T{下标f}附近未显示出任何可见的奇点，表明在该温度下不存在长程磁序。此外，在T{下标f}以下也观察到宏观时间尺度上的特征剩磁效应和磁弛豫。并将实验结果与正交CeCu{sub 2}型自旋玻璃化合物U{sub 2}AuGa{sub 3}和六方AlB{sub 2}型自旋玻璃化合物U{sub 2}PdSi{sub 3}进行了比较。
The results of dc susceptibility, magnetization, magnetic relaxation and specific heat measurements on U{sub 2}CuGa{sub 3}, a compound reported early in the literature as exhibiting interesting magnetic properties, are presented. The temperature dependence of susceptibility measured in the zero-field cooling (ZFC) mode and in the field cooling (FC) mode displays spin-glass behavior below a characteristic temperature T{sub f} ({approx}16 K) in agreement with the literature. As a new evidence for the formation of spin-glass state in this compound, the specific heat data do not show any visible singularity around T{sub f} indicating the absence of long-range magnetic order at this temperature. Furthermore, the characteristic remanence effect and magnetic relaxation on a macroscopic time scale are also observed below T{sub f}. The experimental results are compared with those of orthorhombic CeCu{sub 2}-type spin-glass compound U{sub 2}AuGa{sub 3} and hexagonal AlB{sub 2}-type spin-glass compound U{sub 2}PdSi{sub 3}.