Anisotropic scattering in angular-dependent magnetoresistance oscillations of quasi-2D and quasi-1D metals: beyond the relaxation-time approximation

TL;DR

This paper extends the theoretical understanding of angular-dependent magnetoresistance oscillations in quasi-2D and quasi-1D metals by incorporating arbitrary elastic scattering, revealing how resistivity depends on scattering momentum-dependence.

Contribution

It generalizes the resistivity expression beyond the relaxation-time approximation, allowing for arbitrary momentum-dependent scattering in AMRO analysis.

Findings

Resistivity depends on the momentum-dependence of scattering probability.

Interlayer resistivity in tilted magnetic fields reveals detailed scattering information.

The results clarify the interpretation of relaxation rates from AMRO data.

Abstract

The electrical resistivity for a current moving perpendicular to layers (chains) in quasi-2D (quasi-1D) metals under an applied magnetic field of varying orientation is studied using Boltzmann transport theory. We consider the simplest non-trivial quasi-2D and quasi-1D Fermi surfaces but allow for an arbitrary elastic collision integral (i.e., a scattering probability with arbitrary dependence on momentum-transfer) and obtain an expression for the resistivity which generalizes that previously found using a single relaxation-time approximation. The dependence of the resistivity on the angle between the magnetic field and current changes depending on the momentum-dependence of the scattering probability. So, whereas zero-field intra-layer transport is sensitive only to the momentum-averaged scattering probability (the transport relaxation rate) the resistivity perpendicular to layers measured in a tilted magnetic field provides detailed information about the momentum-dependence of interlayer scattering. These results help clarify the meaning of the relaxation rate determined from fits of angular-dependent magnetoresistance oscillations (AMRO) experimental data to theoretical expressions. Furthermore, we suggest how AMRO might be used to probe the dominant scattering mechanism.