Investigation of Planckian behavior in a high-conductivity oxide: PdCrO_2
arxiv(2023)
摘要
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/ħ.
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