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Zhakina E, Daou R, Maignan A, McGuinness PH, König M, Rosner H, Kim SJ, Khim S, Grasset R, Konczykowski M, Tulipman E, Mendez-Valderrama JF, Chowdhury D, Berg E, Mackenzie AP. Investigation of Planckian behavior in a high-conductivity oxide: PdCrO 2. Proc Natl Acad Sci U S A 2023; 120:e2307334120. [PMID: 37639594 PMCID: PMC10483643 DOI: 10.1073/pnas.2307334120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Accepted: 06/23/2023] [Indexed: 08/31/2023] Open
Abstract
The layered delafossite metal PdCrO[Formula: see text] is a natural heterostructure of highly conductive Pd layers Kondo coupled to localized spins in the adjacent Mott insulating CrO[Formula: see text] layers. At high temperatures, T, it has a T-linear resistivity which is not seen in the isostructural but nonmagnetic PdCoO[Formula: see text]. The strength of the Kondo coupling is known, as-grown crystals are extremely high purity and the Fermi surface is both very simple and experimentally known. It is therefore an ideal material platform in which to investigate "Planckian metal" 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[Formula: see text] of the Planckian value of k[Formula: see text]T/[Formula: see text].
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Affiliation(s)
- Elina Zhakina
- Max Planck Institute for Chemical Physics of Solids, Dresden01187, Germany
| | - Ramzy Daou
- Laboratoire de Cristallographie et Sciences des Matériaux, Normandie Université, UMR6508 CNRS, ENSICAEN, UNICAEN, Caen14000, France
| | - Antoine Maignan
- Laboratoire de Cristallographie et Sciences des Matériaux, Normandie Université, UMR6508 CNRS, ENSICAEN, UNICAEN, Caen14000, France
| | | | - Markus König
- Max Planck Institute for Chemical Physics of Solids, Dresden01187, Germany
| | - Helge Rosner
- Max Planck Institute for Chemical Physics of Solids, Dresden01187, Germany
| | - Seo-Jin Kim
- Max Planck Institute for Chemical Physics of Solids, Dresden01187, Germany
| | - Seunghyun Khim
- Max Planck Institute for Chemical Physics of Solids, Dresden01187, Germany
| | - Romain Grasset
- Laboratoire des Solides Irradiés, CEA/DRF/IRAMIS, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, PalaiseauF-91128, France
| | - Marcin Konczykowski
- Laboratoire des Solides Irradiés, CEA/DRF/IRAMIS, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, PalaiseauF-91128, France
| | - Evyatar Tulipman
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot76100, Israel
| | | | | | - Erez Berg
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot76100, Israel
| | - Andrew P. Mackenzie
- Max Planck Institute for Chemical Physics of Solids, Dresden01187, Germany
- Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, St. AndrewsKY16 9SS, United Kingdom
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