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. 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

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. 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^*

^*Corresponding author for this work

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

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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

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Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). This is an open-access article distributed under the terms of the Creative Commons Attribution license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Final published version, 471 KBLicence: CC BY

Engineered Quantum States: Engineered quantum states via atmoic-scale assembly of artificial 2D heterostructures
King, P. (PI)
The Leverhulme Trust
1/08/17 → 31/07/22
Project: Standard
ERC Starting Grant QUESTDO: H2020 ERC Starting Grant QUESTDO
King, P. (PI)
European Research Council
1/01/17 → 31/12/21
Project: Fellowship

Probing spin correlations using angle resolved photoemission in a coupled metallic/Mott insulator system (dataset)
Sunko, V. (Creator), Mazzola, F. (Creator), . Kitamura, S. (Creator), Khim, S. (Creator), Kushwaha, P. (Creator), Clark, O. J. (Creator), Watson, M. D. (Creator), Biswas, D. (Creator), Pourovskii, L. (Creator), Kim, K. (Creator), Lee, T. (Creator), Thakur, P. (Creator), Rosner, H. (Creator), Georges, A. (Creator), Moessner, R. (Creator), Oka, T. (Creator), Mackenzie, A. P. (Creator) & King, P. D. (Creator), University of St Andrews, 5 Sept 2019
DOI: 10.17630/54473334-dab4-4598-ae1a-ad38c2271d35
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Sunko, V., Mazzola, F., Kitamura, S., Khim, S., Kushwaha, P., Clark, O. J., Watson, M., Markovic, 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 M. Watson and I. Markovic 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: 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); 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",

year = "2020",

month = feb,

day = "7",

doi = "10.1126/sciadv.aaz0611",

language = "English",

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issn = "2375-2548",

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Sunko, V, Mazzola, F, Kitamura, S, Khim, S, Kushwaha, P, Clark, OJ, Watson, M, Markovic, I, Biswas, D, Pourovskii, L, Kim, TK, Lee, T-L, 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.

AU - Markovic, 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: 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); 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

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.

U2 - 10.1126/sciadv.aaz0611

DO - 10.1126/sciadv.aaz0611

M3 - Article

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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Engineered Quantum States: Engineered quantum states via atmoic-scale assembly of artificial 2D heterostructures

ERC Starting Grant QUESTDO: H2020 ERC Starting Grant QUESTDO

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Probing spin correlations using angle resolved photoemission in a coupled metallic/Mott insulator system (dataset)

Cite this