Stretched exponential behavior in remanent lattice striction of a (La,Pr)${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$ bilayer manganite single crystal

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.

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