当前位置: X-MOL 学术Science › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Coherent band excitations in CePd3: A comparison of neutron scattering and ab initio theory
Science ( IF 56.9 ) Pub Date : 2018-01-11 , DOI: 10.1126/science.aan0593
Eugene A. Goremychkin 1 , Hyowon Park 2, 3 , Raymond Osborn 2 , Stephan Rosenkranz 2 , John-Paul Castellan 2, 4 , Victor R. Fanelli 5 , Andrew D. Christianson 6 , Matthew B. Stone 6 , Eric D. Bauer 7 , Kenneth J. McClellan 7 , Darrin D. Byler 7 , Jon M. Lawrence 7, 8
Affiliation  

Neutrons peek into f-electron bands Neutron scattering can be used to tease out the details of collective magnetic excitations that yield well-defined peaks in the data. In principle, it could also be used to look into single-electron band excitations, but collecting enough data to capture broad distributions of intensity is tricky. Goremychkin et al. used neutron spectrometers that could efficiently capture a large amount of data by rotating the sample, a crystal of the intermediatevalence compound CePd3 (see the Perspective by Georges). The measured dynamical magnetic susceptibility, in combination with detailed ab initio calculations, showed the formation of coherent f-electron bands at low temperatures. Science, this issue p. 186; see also p. 162 Inelastic neutron scattering with a rotating sample is used to reveal coherent f-electron bands at low temperatures. In common with many strongly correlated electron systems, intermediate valence compounds are believed to display a crossover from a high-temperature regime of incoherently fluctuating local moments to a low-temperature regime of coherent hybridized bands. We show that inelastic neutron scattering measurements of the dynamic magnetic susceptibility of CePd3 provides a benchmark for ab initio calculations based on dynamical mean field theory. The magnetic response is strongly momentum dependent thanks to the formation of coherent f-electron bands at low temperature, with an amplitude that is strongly enhanced by local particle-hole interactions. The agreement between experiment and theory shows that we have a robust first-principles understanding of the temperature dependence of f-electron coherence.

中文翻译:

CePd3 中的相干带激发:中子散射和从头算理论的比较

中子窥视 f 电子带 中子散射可用于梳理集体磁激发的细节,从而在数据中产生明确的峰值。原则上,它也可以用于研究单电子带激发,但收集足够的数据来捕捉广泛的强度分布是很棘手的。Goremychkin 等。使用的中子能谱仪可以通过旋转样品(一种中间价化合物 CePd3 的晶体)有效地捕获大量数据(参见 Georges 的观点)。测量的动态磁化率与详细的 ab initio 计算相结合,表明在低温下形成了相干的 f 电子带。科学,这个问题 p。186; 另见第。162 旋转样品的非弹性中子散射用于揭示低温下的相干 f 电子带。与许多强相关电子系统一样,中间价化合物被认为表现出从非相干波动局部矩的高温状态到相干杂化带的低温状态的交叉。我们表明,CePd3 动态磁化率的非弹性中子散射测量为基于动态平均场理论的从头计算提供了基准。由于在低温下形成相干的 f 电子带,磁响应强烈依赖于动量,其振幅通过局部粒子 - 空穴相互作用强烈增强。
更新日期:2018-01-11
down
wechat
bug