Investigation of Planckian behavior in a high-conductivity oxide: PdCrO2

Elina Zhakina; Ramzy Daou; Antoine Maignan; Philippa H. McGuinness; Markus König; Helge Rosner; Seo-Jin Kim; Seunghyun Khim; Romain Grasset; Marcin Konczykowski; Evyatar Tulipman; Juan Felipe Mendez-Valderrama; Debanjan Chowdhury; Erez Berg; Andrew P. Mackenzie

doi:10.1073/pnas.2307334120

Investigation of Planckian behavior in a high-conductivity oxide: PdCrO₂

Elina Zhakina^*
, Ramzy Daou
, Antoine Maignan
, Philippa H. McGuinness
, Markus König
, Helge Rosner
, Seo-Jin Kim
, Seunghyun Khim
, Romain Grasset
, Marcin Konczykowski
, Evyatar Tulipman
, Juan Felipe Mendez-Valderrama
, Debanjan Chowdhury
, Erez Berg
, Andrew P. Mackenzie

^*Corresponding author for this work

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

Abstract

The layered delafossite metal PdCrO₂ is a natural heterostructure ofhighly conductive Pd layers Kondo coupled to localized spins in the adjacent Mott insulating CrO₂ layers. At high temperatures T it has a T-linearresistivity which is not seen in the isostructural but non-magnetic PdCoO₂.The strength of the Kondo coupling is known, as-grown crystals are extremelyhigh purity and the Fermi surface is both very simple and experimentally known. It is therefore an ideal material platform in which to investigate 'Planckianmetal' physics. We do this by means of controlled introduction of point disorder, measurement of the thermal conductivity and Lorenz ratio and studying the sources of its high temperature entropy. The T-linear resistivity is seen to be due mainly to elastic scattering and to arise from a sum of several scattering mechanisms. Remarkably, this sum leads to a scattering rate within 10% of the Planckian value of kBT/ℏ.

Original language	English
Article number	e2307334120
Number of pages	8
Journal	Proceedings of the National Academy of Sciences
Volume	120
Issue number	36
Early online date	28 Aug 2023
DOIs	https://doi.org/10.1073/pnas.2307334120
Publication status	Published - 5 Sept 2023

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Investigation of Planckian behavior in a high-conductivity oxide: PdCrO2 (dataset)
Zhakina, E. (Creator), Daou, R. (Creator), Maignan, A. (Creator), McGuinness, P. (Creator), König, M. (Creator), Rosner, H. (Creator), Kim, S.-J. (Creator), Khim, S. (Creator), Grasset, R. (Creator), Konczykowski, M. (Creator), Tulipman, E. (Creator), Mendez-Valderrama, J. F. (Creator), Chowdhury, D. (Creator), Berg, E. (Creator) & Mackenzie, A. (Creator), University of St Andrews, 13 Sept 2023
DOI: 10.17630/db5c80b5-a268-4885-a711-707ea393a7fe
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Zhakina, E., Daou, R., Maignan, A., McGuinness, P. H., König, M., Rosner, H., Kim, S.-J., Khim, S., Grasset, R., Konczykowski, M., Tulipman, E., Mendez-Valderrama, J. F., Chowdhury, D., Berg, E., & Mackenzie, A. P. (2023). Investigation of Planckian behavior in a high-conductivity oxide: PdCrO₂. Proceedings of the National Academy of Sciences, 120(36), Article e2307334120. https://doi.org/10.1073/pnas.2307334120

@article{ce6e1e0d8c48443ca23e329d28eb6cb3,

title = "Investigation of Planckian behavior in a high-conductivity oxide: PdCrO2",

abstract = "The layered delafossite metal PdCrO2 is a natural heterostructure ofhighly conductive Pd layers Kondo coupled to localized spins in the adjacent Mott insulating CrO2 layers. At high temperatures T it has a T-linearresistivity which is not seen in the isostructural but non-magnetic PdCoO2.The strength of the Kondo coupling is known, as-grown crystals are extremelyhigh purity and the Fermi surface is both very simple and experimentally known. It is therefore an ideal material platform in which to investigate 'Planckianmetal' physics. We do this by means of controlled introduction of point disorder, measurement of the thermal conductivity and Lorenz ratio and studying the sources of its high temperature entropy. The T-linear resistivity is seen to be due mainly to elastic scattering and to arise from a sum of several scattering mechanisms. Remarkably, this sum leads to a scattering rate within 10\% of the Planckian value of kBT/ℏ. ",

author = "Elina Zhakina and Ramzy Daou and Antoine Maignan and McGuinness, \{Philippa H.\} and Markus K{\"o}nig and Helge Rosner and Seo-Jin Kim and Seunghyun Khim and Romain Grasset and Marcin Konczykowski and Evyatar Tulipman and Mendez-Valderrama, \{Juan Felipe\} and Debanjan Chowdhury and Erez Berg and Mackenzie, \{Andrew P.\}",

note = "Funding: JFMV and DC are supported by faculty startup grants at Cornell University. ET and EB were supported by the European Research Council (ERC) under grant HQMAT (Grant Agreement No. 817799), the Israel-US Binational Science Foundation (BSF), and the Minerva Foundation.",

year = "2023",

month = sep,

day = "5",

doi = "10.1073/pnas.2307334120",

language = "English",

volume = "120",

journal = "Proceedings of the National Academy of Sciences",

issn = "0027-8424",

publisher = "National Academy of Sciences",

number = "36",

}

Zhakina, E, Daou, R, Maignan, A, McGuinness, PH, König, M, Rosner, H, Kim, S-J, Khim, S, Grasset, R, Konczykowski, M, Tulipman, E, Mendez-Valderrama, JF, Chowdhury, D, Berg, E & Mackenzie, AP 2023, 'Investigation of Planckian behavior in a high-conductivity oxide: PdCrO₂', Proceedings of the National Academy of Sciences, vol. 120, no. 36, e2307334120. https://doi.org/10.1073/pnas.2307334120

TY - JOUR

T1 - Investigation of Planckian behavior in a high-conductivity oxide

T2 - PdCrO2

AU - Zhakina, Elina

AU - Daou, Ramzy

AU - Maignan, Antoine

AU - McGuinness, Philippa H.

AU - König, Markus

AU - Rosner, Helge

AU - Kim, Seo-Jin

AU - Khim, Seunghyun

AU - Grasset, Romain

AU - Konczykowski, Marcin

AU - Tulipman, Evyatar

AU - Mendez-Valderrama, Juan Felipe

AU - Chowdhury, Debanjan

AU - Berg, Erez

AU - Mackenzie, Andrew P.

N1 - Funding: JFMV and DC are supported by faculty startup grants at Cornell University. ET and EB were supported by the European Research Council (ERC) under grant HQMAT (Grant Agreement No. 817799), the Israel-US Binational Science Foundation (BSF), and the Minerva Foundation.

PY - 2023/9/5

Y1 - 2023/9/5

N2 - The layered delafossite metal PdCrO2 is a natural heterostructure ofhighly conductive Pd layers Kondo coupled to localized spins in the adjacent Mott insulating CrO2 layers. At high temperatures T it has a T-linearresistivity which is not seen in the isostructural but non-magnetic PdCoO2.The strength of the Kondo coupling is known, as-grown crystals are extremelyhigh purity and the Fermi surface is both very simple and experimentally known. It is therefore an ideal material platform in which to investigate 'Planckianmetal' physics. We do this by means of controlled introduction of point disorder, measurement of the thermal conductivity and Lorenz ratio and studying the sources of its high temperature entropy. The T-linear resistivity is seen to be due mainly to elastic scattering and to arise from a sum of several scattering mechanisms. Remarkably, this sum leads to a scattering rate within 10% of the Planckian value of kBT/ℏ.

AB - The layered delafossite metal PdCrO2 is a natural heterostructure ofhighly conductive Pd layers Kondo coupled to localized spins in the adjacent Mott insulating CrO2 layers. At high temperatures T it has a T-linearresistivity which is not seen in the isostructural but non-magnetic PdCoO2.The strength of the Kondo coupling is known, as-grown crystals are extremelyhigh purity and the Fermi surface is both very simple and experimentally known. It is therefore an ideal material platform in which to investigate 'Planckianmetal' physics. We do this by means of controlled introduction of point disorder, measurement of the thermal conductivity and Lorenz ratio and studying the sources of its high temperature entropy. The T-linear resistivity is seen to be due mainly to elastic scattering and to arise from a sum of several scattering mechanisms. Remarkably, this sum leads to a scattering rate within 10% of the Planckian value of kBT/ℏ.

U2 - 10.1073/pnas.2307334120

DO - 10.1073/pnas.2307334120

M3 - Editorial

SN - 0027-8424

VL - 120

JO - Proceedings of the National Academy of Sciences

JF - Proceedings of the National Academy of Sciences

IS - 36

M1 - e2307334120

ER -

Investigation of Planckian behavior in a high-conductivity oxide: PdCrO2

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Investigation of Planckian behavior in a high-conductivity oxide: PdCrO2 (dataset)

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Investigation of Planckian behavior in a high-conductivity oxide: PdCrO₂