# Anomalous c-axis transport in layered metals

## TL;DR

This paper investigates the anisotropic transport properties of layered metals, demonstrating the robustness of coherent band transport and proposing a phonon-assisted tunneling model to explain non-monotonic c-axis resistivity behavior.

## Contribution

It introduces a model of phonon-assisted tunneling to explain anomalous c-axis transport in layered metals with anisotropic spectra.

## Key findings

- Coherent band transport persists with high $E_F\tau$
- Phonon-assisted tunneling explains non-monotonic resistivity
- Standard Boltzmann equation applies to all directions

## Abstract

Transport in metals with strongly anisotropic single-particle spectrum is studied. Coherent band transport in all directions, described by the standard Boltzmann equation, is shown to withstand both elastic and inelastic scattering as long as $E_F\tau\gg 1$. A model of phonon-assisted tunneling via resonant states located in between the layers is suggested to explain a non-monotonic temperature dependence of the c-axis resistivity observed in experiments.