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. D. Watson; I. Marković; 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

doi:10.1126/sciadv.aaz0611

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. D. Watson, I. Marković, 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

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

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 language	English
Article number	eaaz0611
Journal	Science Advances
Volume	6
Issue number	6
DOIs	https://doi.org/10.1126/sciadv.aaz0611
Publication status	Published - 7 Feb 2020

Bibliographical note

Funding Information:
We thank J. Schmalian, K. Kuroki, C. Hooley, A. Rost, and B. Schmidt for useful discussions. Funding: We acknowledge support from the European Research Council (grant nos. ERC-714193-QUESTDO and ERC-319286-QMAC), the Royal Society, the Leverhulme Trust (grant nos. RL-2016-006 and PLP-2015-144R), the Max-Planck Society, the Simons Foundation, and the International Max-Planck Partnership for Measurement and Observation at the Quantum Limit. V.S. and O.J.C. acknowledge EPSRC for PhD studentship support through grant numbers EP/L015110/1 and EP/K503162/1. I.M. acknowledges PhD studentship support from the IMPRS for the Chemistry and Physics of Quantum Materials. We thank Diamond Light Source for access to beamlines I09 (proposal no. SI19479) and I05 (proposal no. SI17699), which contributed to the results presented here. The work at the Max Planck Institute for the Physics of Complex Systems was supported in part by the Deutsche Forschungsgemeinschaft under grants SFB 1143 (project-id 247310070) and the cluster of

Publisher Copyright:
Copyright © 2020 The Authors

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10.1126/sciadv.aaz0611

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Sunko, V., Mazzola, F., Kitamura, S., Khim, S., Kushwaha, P., Clark, O. J., Watson, M. D., Marković, I., Biswas, D., Pourovskii, L., Kim, T. K., Lee, T. L., Thakur, P. K., Rosner, H., Georges, A., Moessner, R., Oka, T., Mackenzie, A. P., & King, P. D. C. (2020). Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system. Science Advances, 6(6), Article eaaz0611. https://doi.org/10.1126/sciadv.aaz0611

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title = "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.",

author = "V. Sunko and F. Mazzola and S. Kitamura and S. Khim and P. Kushwaha and Clark, {O. J.} and Watson, {M. D.} and I. Markovi{\'c} and D. Biswas and L. Pourovskii and Kim, {T. K.} and Lee, {T. L.} and Thakur, {P. K.} and H. Rosner and A. Georges and R. Moessner and T. Oka and Mackenzie, {A. P.} and King, {P. D.C.}",

note = "Funding Information: We thank J. Schmalian, K. Kuroki, C. Hooley, A. Rost, and B. Schmidt for useful discussions. Funding: We acknowledge support from the European Research Council (grant nos. ERC-714193-QUESTDO and ERC-319286-QMAC), the Royal Society, the Leverhulme Trust (grant nos. RL-2016-006 and PLP-2015-144R), the Max-Planck Society, the Simons Foundation, and the International Max-Planck Partnership for Measurement and Observation at the Quantum Limit. V.S. and O.J.C. acknowledge EPSRC for PhD studentship support through grant numbers EP/L015110/1 and EP/K503162/1. I.M. acknowledges PhD studentship support from the IMPRS for the Chemistry and Physics of Quantum Materials. We thank Diamond Light Source for access to beamlines I09 (proposal no. SI19479) and I05 (proposal no. SI17699), which contributed to the results presented here. The work at the Max Planck Institute for the Physics of Complex Systems was supported in part by the Deutsche Forschungsgemeinschaft under grants SFB 1143 (project-id 247310070) and the cluster of Publisher Copyright: Copyright {\textcopyright} 2020 The Authors",

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doi = "10.1126/sciadv.aaz0611",

language = "English",

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Sunko, V, Mazzola, F, Kitamura, S, Khim, S, Kushwaha, P, Clark, OJ, Watson, MD, Marković, I, Biswas, D, Pourovskii, L, Kim, TK, Lee, TL, Thakur, PK, Rosner, H, Georges, A, Moessner, R, Oka, T, Mackenzie, AP & King, PDC 2020, 'Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system', Science Advances, vol. 6, no. 6, eaaz0611. https://doi.org/10.1126/sciadv.aaz0611

TY - JOUR

T1 - Probing spin correlations using angle-resolved photoemission in a coupled metallic/Mott insulator system

AU - Sunko, V.

AU - Mazzola, F.

AU - Kitamura, S.

AU - Khim, S.

AU - Kushwaha, P.

AU - Clark, O. J.

AU - Watson, M. D.

AU - Marković, I.

AU - Biswas, D.

AU - Pourovskii, L.

AU - Kim, T. K.

AU - Lee, T. L.

AU - Thakur, P. K.

AU - Rosner, H.

AU - Georges, A.

AU - Moessner, R.

AU - Oka, T.

AU - Mackenzie, A. P.

AU - King, P. D.C.

N1 - Funding Information: We thank J. Schmalian, K. Kuroki, C. Hooley, A. Rost, and B. Schmidt for useful discussions. Funding: We acknowledge support from the European Research Council (grant nos. ERC-714193-QUESTDO and ERC-319286-QMAC), the Royal Society, the Leverhulme Trust (grant nos. RL-2016-006 and PLP-2015-144R), the Max-Planck Society, the Simons Foundation, and the International Max-Planck Partnership for Measurement and Observation at the Quantum Limit. V.S. and O.J.C. acknowledge EPSRC for PhD studentship support through grant numbers EP/L015110/1 and EP/K503162/1. I.M. acknowledges PhD studentship support from the IMPRS for the Chemistry and Physics of Quantum Materials. We thank Diamond Light Source for access to beamlines I09 (proposal no. SI19479) and I05 (proposal no. SI17699), which contributed to the results presented here. The work at the Max Planck Institute for the Physics of Complex Systems was supported in part by the Deutsche Forschungsgemeinschaft under grants SFB 1143 (project-id 247310070) and the cluster of Publisher Copyright: Copyright © 2020 The Authors

PY - 2020/2/7

Y1 - 2020/2/7

N2 - 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.

AB - 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.

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DO - 10.1126/sciadv.aaz0611

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AN - SCOPUS:85079087062

SN - 2375-2548

VL - 6

JO - Science Advances

JF - Science Advances

IS - 6

M1 - eaaz0611

ER -

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

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