Unusual charge transport and spin response of doped bilayer triangular antiferromagnets

TL;DR

This paper investigates the charge transport and spin response in doped bilayer triangular antiferromagnets using the t-J model, revealing behaviors similar to single layers but with notable features like band splitting and incommensurate peaks.

Contribution

It extends the understanding of doped bilayer triangular antiferromagnets by analyzing their charge and spin dynamics considering bilayer interactions within the t-J model.

Findings

Conductivity spectrum exhibits low-energy peak and midinfrared band.

Resistivity shows nonlinear metallic-like behavior at high temperatures and deviations at low temperatures.

Neutron scattering peaks split into six incommensurate peaks with doping, increasing then saturating.

Abstract

Within the t-J model, the charge transport and spin response of the doped bilayer triangular antiferromagnet are studied by considering the bilayer interaction. Although the bilayer interaction leads to the band splitting in the electronic structure, the qualitative behaviors of the physical properties are the same as in the single layer case. The conductivity spectrum shows the low-energy peak and unusual midinfrared band, the temperature dependent resistivity is characterized by the nonlinearity metallic-like behavior in the higher temperature range, and the deviation from the metallic-like behavior in the lower temperature range, and the commensurate neutron scattering peak near the half-filling is split into six incommensurate peaks in the underdoped regime, with the incommensurability increases with the hole concentration at lower dopings, and saturates at higher dopings.