Evolution of the Kondo lattice electronic structure above the transport coherence temperature

作者：Sooyoung Jang, Jonathan D. Denlinger, J. W. Allen, Vivien S. Zapf, M. B. Maple, Jae Nyeong Kim, Bo Gyu Jang, Ji Hoon Shim · 发表于：Proceedings of the National Academy of Sciences · 年份：2020 · DOI：10.1073/pnas.2001778117 · 被引用次数：78 · 研究领域：Rare-earth and actinide compounds、Physics of Superconductivity and Magnetism、Quantum and electron transport phenomena

Significance The temperature ( T )-dependent evolution of the Kondo lattice electronic structure is a long-standing topic of theoretical and experimental investigation, still lacking a truly microscopic theory that agrees with a full experimental characterization. Here multiple characteristic T scales of the interaction of localized f moments with conduction electrons in the Kondo lattice CeCo I n 5 are identified and investigated using angle-resolved photoemission measurements that substantiate dynamical mean-field theory which newly includes the full realism of crystalline electric-field (CEF) f splittings. Thereby errors in the itinerant versus localized f -state classification from standard density functional theory are corrected, microscopic insight into the broad T -range crossover of f -hybridization effects is gained, and a prediction of CEF degeneracy crossover below the lattice coherence T is made.