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

Abstract

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_{B}T/$$\hslash$.

References in corpus (16)

• Quantum Criticality in Twisted Transition Metal Dichalcogenides
• The properties of ultrapure delafossite metals
• Quantum critical behavior in magic-angle twisted bilayer graphene
• Planckian Dissipation in Metals
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• Reconciling scaling of the optical conductivity of cuprate superconductors with Planckian resistivity and specific heat
• Superconductivity in an extreme strange metal
• Magnetic structure of the conductive triangular-lattice antiferromagnet PdCrO2
• A stability bound on the $T$-linear resistivity of conventional metals
• Planckian properties of 2D semiconductor systems
• Characterization of two electronic subsystems in cuprates through optical conductivity
• Investigation of Planckian behavior in a high-conductivity oxide: PdCrO${}_2$
• Intermediate-scale theory for electrons coupled to frustrated local-moments
• $T-$linear resistivity from magneto-elastic scattering: application to PdCrO${}_2$

Cited by in corpus (3)

• Stripe magnetic order and field-induced quantum criticality in the perfect triangular-lattice antiferromagnet CsCeSe${}_2$
• Investigation of Planckian behavior in a high-conductivity oxide: PdCrO${}_2$
• $T-$linear resistivity from magneto-elastic scattering: application to PdCrO${}_2$