Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system
MetadataShow full item record
Altmetrics Handle Statistics
Altmetrics DOI Statistics
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.
Sunko , V , Mazzola , F , Kitamura , S , Khim , S , Kushwaha , P , Clark , O J , Watson , M , Markovic , I , Biswas , D , Pourovskii , L , Kim , T K , Lee , T -L , Thakur , P K , Rosner , H , Georges , A , Moessner , R , Oka , T , Mackenzie , A P & King , P D C 2020 , ' Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system ' , Science Advances , vol. 6 , no. 6 , eaaz0611 . https://doi.org/10.1126/sciadv.aaz0611
Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). This is an open-access article distributed under the terms of the Creative Commons Attribution license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.