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

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.

SUBMITTER: Sunko V 

PROVIDER: S-EPMC7032925 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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

Sunko V V   Mazzola F F   Kitamura S S   Khim S S   Kushwaha P P   Clark O J OJ   Watson M D MD   Marković I I   Biswas D D   Pourovskii L L   Kim T K TK   Lee T-L TL   Thakur P K PK   Rosner H H   Georges A A   Moessner R R   Oka T T   Mackenzie A P AP   King P D C PDC  

Science advances 20200207 6

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 PdCrO<sub>2</sub>, nearly free and Mott-localized electrons exist in alternating layers, forming natural heterostructures. Using angle-resolved photoemission spectroscopy, quantitatively supported by a strong coupling ana  ...[more]