Dimensional Crossover driven by Magnetic Ordering in Optical Conductivity of Pr_{1/2}Sr_{1/2}MnO_3

TL;DR

This study explores how magnetic ordering influences optical conductivity in Pr_{0.5}Sr_{0.5}MnO_3, revealing a dimensional crossover from 3D to 2D metals near the Neel temperature linked to spectral weight transfer.

Contribution

It demonstrates the correlation between magnetic phase transition and optical spectral weight transfer, explaining the crossover from 3D to 2D metallic behavior in Pr_{0.5}Sr_{0.5}MnO_3.

Findings

Spectral weight transfer correlates with magnetic phase transition.

Optical properties indicate a 3D to 2D metallic crossover.

Spectral changes align with the polaron model.

Abstract

We investigated optical properties of Pr_{0.5}Sr_{0.5}MnO_3, which has the A-type antiferromagnetic ordering at a low temperature. We found that T- dependence of spectral weight transfer shows a clear correlation with the magnetic phase transition. In comparison with the optical conductivity results of Nd_{0.5}Sr_{0.5}MnO_3, which has the CE-type antiferromagnetic charge ordering, we showed that optical properties of Pr_{0.5}Sr_{0.5}MnO_3 near the Neel temperature could be explained by a crossover from 3D to 2D metals. Details of spectral weight changes are consistent with the polaron picture.