Journal
SCIENCE ADVANCES
Volume 6, Issue 6, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aaz0611
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Funding
- European Research Council [ERC-714193-QUESTDO, ERC-319286-QMAC]
- Royal Society
- Leverhulme Trust [RL-2016-006, PLP-2015-144R]
- Max-Planck Society
- Simons Foundation
- International Max-Planck Partnership for Measurement and Observation at the Quantum Limit
- EPSRC [EP/L015110/1, EP/K503162/1]
- IMPRS for the Chemistry and Physics of Quantum Materials
- Deutsche Forschungsgemeinschaft [SFB 1143, 247310070, EXC 2147, 39085490]
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A nearly free electron metal and a Mott insulating state can be thought of as opposite ends of the spectrum of possibilities for the motion of electrons in a solid. Understanding their interaction lies at the heart of the correlated electron problem. In the magnetic oxide metal PdCrO2, nearly free and Mott-localized electrons exist in alternating layers, forming natural heterostructures. Using angle-resolved photoemission spectroscopy, quantitatively supported by a strong coupling analysis, we show that the coupling between these layers leads to an intertwined excitation that is a convolution of the charge spectrum of the metallic layer and the spin susceptibility of the Mott layer. Our findings establish PdCrO2 as a model system in which to probe Kondo lattice physics and also open new routes to use the a priori nonmagnetic probe of photoemission to gain insights into the spin susceptibility of correlated electron materials.
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