Comment on Dynamics distortions and polaronic effects in the paramagnetic state of La$_{0.8}$Ba$_{0.2}$Mn$_{1-x}$Al$_x$O$_3$

TL;DR

This paper comments on previous findings of dynamics distortions and polaronic effects in La-Ba-Mn-Al-O manganites, clarifying phase diagram details and identifying a spin-glass state at specific doping levels.

Contribution

It completes the phase diagram of the manganite system and highlights the presence of a spin-glass state at x=0.15 doping, which was previously overlooked.

Findings

Confirmed the phase diagram details of La-Ba-Mn-Al-O manganites.

Identified a spin-glass state at x=0.15 doping.

Clarified the nature of dynamics distortions and polaronic effects.

Abstract

Recently, the authors of ref.[1], reported dynamics distortion and polaronic effects in the paramagnetic state of $La_{0.8}Ba_{0.2}Mn_{1-x}Al_xO_3$ manganites. In this comment we want to complete the phase diagram(Fig3[1]) and point out of occurring spin-glass state in this manganite which is not intended for x=0.15 doping.