Resistivity of Doped Two-Leg Spin Ladders

TL;DR

This paper investigates charge transport in doped two-leg spin ladders, proposing that boson-phonon and boson-impurity interactions lead to resistivity saturation and a possible local maximum, aligning with experimental observations.

Contribution

It introduces a model considering boson-phonon and impurity scattering to explain resistivity behavior in doped spin ladders, including a saturation mechanism.

Findings

Resistivity may show a local maximum at intermediate temperatures.

Resistivity saturation explained by Ioffe-Regel mechanism.

Model aligns with recent experimental results.

Abstract

In doped two-leg spin ladder systems, holes are expected to form charged bosonic pairs. We study charge transport in this system in the temperature range where the bosons can be described as weakly interacting quasi-particles. We consider boson-phonon and boson-impurity scattering processes. We suggest that due to the Ioffe-Regel resistivity saturation mechanism, the resistivity may exhibit a local maximum at intermediate temperatures. We propose that this may explain a similar feature found in recent experimental results.