论文标题
乌鲁$ _2 $ si $ _2 $中的差距样行为的起源：通过准粒子散射光谱和电阻率测量的合并研究
Origin of gap-like behaviors in URu$_2$Si$_2$: Combined study via quasiparticle scattering spectroscopy and resistivity measurements
论文作者
论文摘要
我们解决了有关URU2SI2中隐藏顺序的两个长期问题：它是否与杂交过程相关联？局部和巡回电子的独特角色是什么？我们的准粒子散射光谱揭示了在URU2SI2中P和FE取代跨越的整个相空间中的杂交间隙无处不在，包括NO-Order和抗磁磁区域，越过相边界的变化最小。这表明其开口与订购不相关，因此本地化的电子必须是主要播放器。为了对仅在过渡温度下观察到的所有其他类似间隙的行为进行一致的理解，我们使用模型分析了电阻率，在该模型中，间隙骨气激发是主要的散射源。由于其刚度遵循异常的温度依赖性（随温度降低而降低），该模型非常适合我们所有的电阻率数据，包括过渡时的跳跃。值得注意的是，提取的间隙随着Fe含量的增加而缓慢增加，类似于通过Q1 =（1.4、0、0）的非弹性中子散射检测到的间隙，这表明是一个共同的起源。这样的模型也可以自然解释霍尔效应的温度依赖性，而无需调用费米表面间隙。
We address two long-standing questions regarding the hidden order in URu2Si2: Is it associated with the hybridization process, and what are the distinct roles played by the localized and itinerant electrons? Our quasiparticle scattering spectroscopy reveals a hybridization gap ubiquitous in the entire phase space spanned by P and Fe substitutions in URu2Si2, including the no-order and antiferromagnetic regions, with minimal change upon crossing the phase boundary. This indicates its opening isn't associated with the ordering, and thus localized electrons must be the major player. Towards a consistent understanding of all the other gap-like behaviors observed only below transition temperatures, we analyze the electrical resistivity using a model in which gapped bosonic excitations are the dominant scattering source. With their stiffness set to follow an unusual temperature dependence (decreasing with decreasing temperature), this model fits all of our resistivity data well including the jump at the transition. Remarkably, the extracted gap increases slowly with increasing Fe content, similarly to the gap detected by inelastic neutron scattering at Q1 = (1.4, 0, 0), suggesting a common origin. Such a model can also naturally explain the Hall effect temperature dependence without invoking Fermi surface gapping.
