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

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  • V. 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
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  • S. Khim, Max Planck Institute for Chemical Physics of Solids
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  • P. Kushwaha, Max Planck Institute for Chemical Physics of Solids, CSIR Indian Institute of Chemical Technology
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  • O. J. Clark, University of St Andrews
  • ,
  • M. D. Watson, University of St Andrews
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  • I. Marković, University of St Andrews, Max Planck Institute for Chemical Physics of Solids
  • ,
  • D. Biswas
  • L. Pourovskii, CNRS, PSL Research University
  • ,
  • 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
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  • A. Georges, CNRS, PSL Research University, Center for Computational Quantum Physics, Flatiron Institute, University of Geneva
  • ,
  • 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

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.

OriginalsprogEngelsk
Artikelnummereaaz0611
TidsskriftScience Advances
Vol/bind6
Nummer6
Antal sider8
ISSN2375-2548
DOI
StatusUdgivet - 2020

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