Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system

V. Sunko, F. Mazzola, S. Kitamura, S. Khim, P. Kushwaha, O. J. Clark, M. Watson, I. Markovic, D. Biswas, L. Pourovskii, T. K. Kim, T. -L. Lee, P. K. Thakur, H. Rosner, A. Georges, R. Moessner, T. Oka*, A. P. Mackenzie*, P. D. C. King*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

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.
Original languageEnglish
Article numbereaaz0611
JournalScience Advances
Volume6
Issue number6
DOIs
Publication statusPublished - 7 Feb 2020

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