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arXiv · 1110.1477

Glass-like kinetic arrest of first-order structural phase transition in LaxMnO3{\pm}δ (x= 1 & 0.9)

Aga Shahee·Dhirendra Kumar·N. P. Lalla
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Abstract

We report here the occurrence of glass-like kinetic-arrest of first-order phase transition of R-3c to Pbnm in a supercooled LaxMnO3\pmδ (X= 1 & 0.9 and δ>0.125) below its insulator-metal transition employing low-temperature transmission electron microscopy (TEM) and x-ray diffraction. No transformation was observed even in a ~12 hrs aged LaxMnO3\pmδ at 98K until unless it was triggered insitu using e-beam irradiation in TEM. A systematic triggering at different temperatures has revealed the occurrence of kinetic-arrest situation similar to stable glass-formers. This has been attributed to the suppression of Johan-Teller distortion by double exchange. PACS number(

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Aga Shahee, Dhirendra Kumar, N. P. Lalla. 2011-10-10. Glass-like kinetic arrest of first-order structural phase transition in LaxMnO3{\pm}δ (x= 1 & 0.9). https://arxiv.org/abs/1110.1477

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