Crystal structure, magnetic and electrical transport studies of single crystals of the uranium mixed chalcogenides: USSe, USte and USeTe
Crystal structure, magnetic and electrical transport studies of single crystals of the uranium mixed chalcogenides: USSe, USte and USeTe
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铀混合硫属化物单晶的晶体结构、磁电输运研究：USSe、USte 和 USeTe
DOI：
10.1016/0022-3697(94)90005-1
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发表时间：
1994
影响因子：
4
通讯作者：
H. Noël
中科院分区：
文献类型：
--
作者：
R. Troć;D. Kaczorowski;L. Shlyk;M. Potel;H. Noël
USSe、USTe和USeTe的晶体结构由单晶X射线衍射数据进行了细化。这些铀混合硫族化合物均为PbCl_2型正交晶胞。对单晶的磁性研究证实了它们的铁磁行为，居里温度分别为24、85和69 K。铀原子的饱和磁矩和有效磁矩分别为1.5，1.55，1.62 μ和3.16，2.92，3.04 μB。在4.2和300 K之间测得的电阻率表明USTe和USeTe的伪半金属行为，而USSe，这是观察到只有高于T = 50 K。在此温度以下，观察到的该化合物的更复杂的电阻率行为[在Tc（T）中的最大值和最小值]可能表明其半导体性质，其能隙为高于Tc的470 K，随着温度的降低，该能隙在磁有序区域中逐渐闭合。
The crystal structure of USSe, USTe and USeTe was refined from single crystal X-ray diffraction data. All these uranium mixed chalcogenides crystallize in the orthorhombic unit-cell related to the PbCl2type. Magnetic studies on single crystals have confirmed their ferromagnetic behaviour with the Curie temperatures of 24, 85 and 69 K respectively. The saturation and effective moments per uranium atom are ∼1.5, 1.55, 1.62 μBand 3.16, 2.92, 3.04 μB, respectively. The electrical resistivity measured between 4.2 and 300 K indicated a pseudo-semimetallic behaviour for USTe and USeTe, while for USSe this is observed only aboveT= 50K. Below this temperature, a more complex resistivity behaviour observed for this compound [maximum and minimum in ϱ (T)] probably indicates its semiconducting properties with an energy gap of 470 K aboveTc, which is gradually closed in the magnetically ordered region with lowering of the temperature.