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Article Dans Une Revue Proceedings of the National Academy of Sciences of the United States of America Année : 2023

Investigation of Planckian behavior in a high-conductivity oxide: PdCrO$_2$

Debanjan Chowdhury

Résumé

The layered delafossite metal PdCrO$_2$ is a natural heterostructure of highly conductive Pd layers Kondo coupled to localized spins in the adjacent Mott insulating CrO$_2$layers. At high temperatures $T$ it has a $T$-linear resistivity which is not seen in the isostructural but non-magnetic PdCoO$_2$. 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% of the Planckian value of k $_BT/$$\hbar$ .
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Dates et versions

hal-04234669 , version 1 (10-10-2023)

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Elina Zhakina, Ramzy Daou, Antoine Maignan, Philippa Mcguinness, Markus König, et al.. Investigation of Planckian behavior in a high-conductivity oxide: PdCrO$_2$. Proceedings of the National Academy of Sciences of the United States of America, 2023, 120 (36), pp.e2307334120. ⟨10.1073/pnas.2307334120⟩. ⟨hal-04234669⟩
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