Magnetic anisotropy and spin-glass behavior in single crystalline U2PdSi3
Magnetic anisotropy and spin-glass behavior in single crystalline U2PdSi3
复制标题
单晶 U2PdSi3 的磁各向异性和自旋玻璃行为
DOI：
10.1088/0953-8984/23/7/076003
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T. Shikama
中科院分区：
文献类型：
--
作者：
D. Li;A. Kimura;Y. Haga;S. Nimori;T. Shikama
本文介绍了在沿着两个典型晶向（-轴和-轴）施加磁场（H）（或测量电流I）时，测量的U_2PdSi_3单晶的磁性和输运性质。对于两个方向，在零直流电场下，自旋冻结温度Tf（= 11.5 K）、初始频移δTf（= 0.023）和激活能Ea/kB（= 90.15 K）相同的情况下，都能在低温下形成自旋玻璃态.磁和输运行为的强各向异性被认为是U2 PdSi 3的一个重要特征。不寻常的铁磁异常的交流磁化率和直流磁化曲线在Tm = 71 K附近观察到的情况下，轴，但不是在轴的情况下。的特征温度Tir，低于该温度下，可以观察到明显的不可逆磁性起源于随机自旋冻结，表现出更强的场依赖性轴比轴。此外，一个不寻常的发现是，电阻率测量表明形成的磁布里渊区边界间隙和更大的磁散射轴，而相干近藤效应的行为是明显的轴。我们还强调，没有电阻率最小值可以检测到下降到2.5 K的任何方向。所观察到的磁性和输运行为进行了比较，在多晶U2 PdSi 3和其他2：1：3金属间化合物。
We present the magnetic and transport properties of single crystalline U2PdSi3 measured with the magnetic field (H) (or measuring current, I) applied along two typical crystallographic directions, i.e. -axis and -axis (or -axis and -axis). For both directions, a spin-glass state is confirmed to form at low temperature with the same spin freezing temperature Tf (= 11.5 K), initial frequency shift δTf (= 0.023) and activation energy Ea/kB (= 90.15 K) in zero dc field. Strong anisotropy in magnetic and transport behavior is found to be a significant feature of U2PdSi3. The unusual ferromagnetic-like anomaly in ac susceptibility and dc magnetization curves around Tm = 71 K is observed in the case of -axis but not in the cases of -axis. The characteristic temperature Tir, below which evident irreversible magnetism originated from random spin freezing can be observed, shows much stronger field dependence for -axis than for -axis. Moreover, an unusual finding is that the electrical resistivity measurements indicate the formation of magnetic Brillouin-zone boundary gaps and much larger magnetic scattering for -axis, while the coherent-Kondo-effect-like behavior is obvious for -axis. We also emphasize that no resistivity minimum can be detected down to 2.5 K for either direction. The observed magnetic and transport behaviors are compared with those in polycrystalline U2PdSi3 and other 2:1:3 intermetallic compounds.
影响因子：
6.2
作者：
T. Yamamura;Dexin Li;K. Yubuta;Y. Shiokawa
通讯作者：
T. Yamamura;Dexin Li;K. Yubuta;Y. Shiokawa