Visualizing the Kondo lattice crossover in YbRh2Si2 with Compton scattering
Visualizing the Kondo lattice crossover in YbRh2Si2 with Compton scattering
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DOI：
10.1103/physrevb.103.115126
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发表时间：
2021-03
影响因子：
3.7
通讯作者：
M. Güttler;K. Kummer;K. Kliemt;C. Krellner;S. Seiro;C. Geibel;C. Laubschat;Y. Kubo;Y. Sakurai;D. Vyalikh;A. Koizumi
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文献类型：
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作者：
M. Güttler;K. Kummer;K. Kliemt;C. Krellner;S. Seiro;C. Geibel;C. Laubschat;Y. Kubo;Y. Sakurai;D. Vyalikh;A. Koizumi
随着相干近藤散射随着温度的升高而崩溃，稀土近藤晶格中的费米面（FS）预计将从计算矩的大FS转变为具有解耦和局域矩的小FS，该大FS形成有效质量随传导态强烈增强的纠缠准粒子。然而，直接观察这种随温度的转变仍然难以实现，因为近藤晶格中的FS的传统探针需要高磁场，这可能会重建FS或无法在高温下可靠地工作。使用高分辨率康普顿散射，我们克服了这些限制，并表明原型 Kondo 晶格中的 FS 拓扑在零磁场下在 14 到 300 K 之间经历了显着变化。特别是，我们提供了在室温下很大程度上恢复小 FS 的明确证据。我们的结果表明了复杂的近藤交叉现象的相关能量尺度。
With the breakdown of coherent Kondo scattering with rising temperature, the Fermi surface (FS) in rare-earth Kondo lattices is expected to transition from thelargeFS counting themoments, which form entangled quasiparticles with strongly enhanced effective masses with the conduction states, to thesmallFS with decoupled and localizedmoments. A direct observation of this transition with temperature has, however, remained elusive, because conventional probes of the FS in Kondo lattices require high magnetic fields, which might reconstruct the FS or cannot work reliably at elevated temperatures. Using high-resolution Compton scattering, we overcome these limitations and show that the FS topology in the prototypical Kondo latticeundergoes pronounced changes between 14 and 300 K in zero magnetic field. In particular, we present clear evidence for a largely restored small FS at room temperature. Our results suggest the relevant energy scale of the complex Kondo crossover phenomenon in.