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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES I09-Surface and Interface Structural Analysis	Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system Veronika Sunko , F. Mazzola , S. Kitamura , S. Khim , P. Kushwaha , O. J. Clark , M. D. 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 Science Advances 6 DOI: 10.1126/sciadv.aaz0611 Diamond Proposal Number(s): [19479, 17699] Show Abstract ▼ 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.	Feb 2020

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