Stretched exponential behavior in remanent lattice striction of a (La,Pr)$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ bilayer manganite single crystal

TL;DR

This study explores the slow dynamics of lattice distortion in a bilayer manganite single crystal, revealing a stretched exponential behavior linked to the interplay of electronic interactions and the colossal magnetoresistance effect.

Contribution

It demonstrates that the remanent magnetostriction follows a stretched exponential decay, highlighting the role of local lattice distortions and orbital interactions in manganites.

Findings

Remanent magnetostriction exhibits stretched exponential behavior.

Spatial growth of lattice distortions correlates with CMR effect.

Orbital-lattice interactions influence lattice dynamics.

Abstract

We have investigated the time dependence of remanent magnetostriction in a (La,Pr)$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$ single crystal, in order to examine the slow dynamics of lattice distortion in bilayered manganites. A competition between double exchange and Jahn-Teller type orbital-lattice interactions results in the observed lattice profile following a stretched exponential function. This finding suggests that spatial growth of the local lattice distortions coupled with e$_{g}$-electron orbital strongly correlates with the appearance of the field-induced CMR effect.