Orbitally defined field-induced electronic state in a Kondo lattice
Orbitally defined field-induced electronic state in a Kondo lattice
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DOI：
10.1103/physrevb.101.165111
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发表时间：
2019-05
影响因子：
3.7
通讯作者：
G. G. Lesseux-G.;H. Sakai;T. Hattori;Y. Tokunaga;S. Kambe;P. Kuhns;A. Reyes;J. Thompson;P. Pagliuso;R. Urbano
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文献类型：
--
作者：
G. G. Lesseux-G.;H. Sakai;T. Hattori;Y. Tokunaga;S. Kambe;P. Kuhns;A. Reyes;J. Thompson;P. Pagliuso;R. Urbano
CeRhIn$_{5}$是近藤晶格的原型，在磁场B$\bf{^{\ast}\simeq}$30 T下，在其反铁磁状态下，诱导出突变的费米面重构和明显的面内电输运各向异性.虽然零场的反铁磁序已经被很好地理解，但由于在高场下微观地探测状态所固有的挑战，在B$^{\ast}$处出现的状态的起源仍然未知。在这里，我们报告的低温核磁共振（NMR）测量揭示了不连续的减少在$^{115}$在正式的奈特位移，没有变化的晶体或磁结构，CeRhIn$_{5}$在字段跨越B$^{\ast}$。我们表明，以上的紧急状态B$^{\ast}$的结果从Ce的4f轨道的变化，所产生的晶体电场（CEF）能级的场诱导演化。这种轨道特性的变化增强了4f和传导电子（c.e.）最终导致在B$\bf{_{c 0} \simeq}$50 T处的巡游量子临界点。
CeRhIn$_{5}$ is a Kondo-lattice prototype in which a magnetic field B$\bf{^{\ast}\simeq}$ 30 T induces an abrupt Fermi-surface (FS) reconstruction and pronounced in-plane electrical transport anisotropy all within its antiferromagnetic state. Though the antiferromagnetic order at zero field is well-understood, the origin of an emergent state at B$^{\ast}$ remains unknown due to challenges inherent to probing states microscopically at high fields. Here, we report low-temperature Nuclear Magnetic Resonance (NMR) measurements revealing a discontinuous decrease in the $^{115}$In formal Knight shift, without changes in crystal or magnetic structures, of CeRhIn$_{5}$ at fields spanning B$^{\ast}$. We show that the emergent state above B$^{\ast}$ results from a change in Ce's 4f orbitals that arises from field-induced evolution of crystal-electric field (CEF) energy levels. This change in orbital character enhances hybridisation between the 4f and the conduction electrons (c.e.) that leads ultimately to an itinerant quantum-critical point at B$\bf{_{c0} \simeq}$ 50 T.