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首页> 外文期刊>Physical review >Interplay between ferromagnetism, SDW order, and underscreened Kondo lattice in UCu_2Si_2
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Interplay between ferromagnetism, SDW order, and underscreened Kondo lattice in UCu_2Si_2

机译：UCu_2Si_2中的铁磁性，SDW顺序和被屏蔽的近藤晶格之间的相互作用

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摘要

Electrical resistivity and low temperature magnetoresistivity (MR) measurements made on a single crystal of UCu_2Si_2 are reported. By using as a phonon reference the temperature dependence of the electrical resistivity of ThCu_2Si_2, we could establish that UCu_2Si_2 has both ferromagnetic (FM) and Kondo behaviors, which can be described by the underscreened Kondo lattice model. Our MR measurements revealed the presence of magnetic fluctuations within the FM order as it had been reported before for UGe_2. Also, one of the calculated Fermi surface sheets exhibited nesting properties, being in perfect agreement with the previous neutron diffraction data, which supports the possibility of the presence of the spin-density wave (SDW) phase. In the ternary silicide considered here in the region of temperatures where the strong FM order exists, this phase is signalized by magnetic fluctuations. The latter may emerge as an ordered antiferromagnetic (AFM) phase of an SDW-like character when the local ferromagnetism disappears at a slightly lower temperature than its F_N. The differences in the lack or observation of these two transitions in the temperature run were found to be strongly sample dependent.
机译：报告了在UCu_2Si_2单晶上进行的电阻率和低温磁阻（MR）测量。通过将ThCu_2Si_2的电阻率与温度的关系用作声子参考，我们可以确定UCu_2Si_2同时具有铁磁（FM）和近藤行为，这可以通过欠屏蔽的近藤晶格模型来描述。我们的MR测量揭示了FM阶内的磁波动的存在，正如之前关于UGe_2的报道。而且，计算出的费米表面板之一具有嵌套特性，与先前的中子衍射数据完全吻合，这支持了存在自旋密度波（SDW）相的可能性。在此处考虑的三元硅化物中，存在强FM级的温度区域中，该相位通过磁涨落来发出信号。当局部铁磁性在略低于其F_N的温度下消失时，后者可能会以SDW状特征的有序反铁磁性（AFM）相出现。发现在温度运行中缺少或观察不到这两个转变的差异与样品密切相关。

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