Publication

Article Metrics

Citations


Online attention

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

DOI: 10.1126/sciadv.aaz0611 DOI Help

Authors: Veronika Sunko (University of St Andrews; Max Planck Institute for Chemical Physics of Solids) , F. Mazzola (University of St Andrews) , S. Kitamura (Max Planck Institute for the Physics of Complex Systems) , S. Khim (Max Planck Institute for Chemical Physics of Solids) , P. Kushwaha (Max Planck Institute for Chemical Physics of Solids) , O. J. Clark (University of St Andrews) , M. D. Watson (University of St Andrews) , I. Markovic (University of St Andrews; Max Planck Institute for Chemical Physics of Solids) , D. Biswas (University of St Andrews) , L. Pourovskii (CPHT, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris; Institut de Physique, Collège de France) , T. K. Kim (Diamond Light Source) , T.-l. Lee (Diamond Light Source) , P. K. Thakur (Diamond Light Source) , H. Rosner (Max Planck Institute for Chemical Physics of Solids) , A. Georges (CPHT, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris; Institut de Physique, Collège de France; Flatiron Institute; Université de Genève) , R. Moessner (Max Planck Institute for the Physics of Complex Systems) , T. Oka (Max Planck Institute for Chemical Physics of Solids; Max Planck Institute for the Physics of Complex Systems) , A. P. Mackenzie (University of St Andrews; Max Planck Institute for Chemical Physics of Solids) , P. D. C. King (University of St Andrews)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Science Advances , VOL 6

State: Published (Approved)
Published: February 2020
Diamond Proposal Number(s): 19479 , 17699

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.

Subject Areas: Physics, Materials, Chemistry


Instruments: I05-ARPES , I09-Surface and Interface Structural Analysis