Polaronic correlations and phonon renormalization in La1-xSrxMnO3 (x = 0.2, 0.3)

Abstract

According to standard theory the magnetoresistance magnitude in ferromagnetic manganites crucially depends on the electron-phonon coupling strength. We showed that in La0.7Sr0.3MnO3 the phonon renormalization is strong, despite its relatively small magnetoresistance. Here, we report results of a similar inelastic neutron scattering investigation of a closely related compound, La0.8Sr0.2MnO3, where the magnetoresistance is enhanced. We find similar phonon renormalization and dynamic CE-type polaron correlations as in La0.7Sr0.3MnO3. However, quantitative comparison of the results for the two samples shows that only polaron lifetime is well correlated with the strength of the CMR.

arXiv comment5 figures

References in corpus (12)

• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
• Dynamic Jahn-Teller Effect and Colossal Magnetoresistance in $L{a}_{1-x}{A}_{x}Mn{O}_3$
• Charge Ordering and Polaron Formation in the Magnetoresistive Oxide La0.7Ca0.3MnO3
• Short-range polaron correlations in the ferromagnetic La(1-x)Ca(x)MnO(3)
• Ferromagnetism and electron-phonon coupling in the manganites
• Glass Transition in the Polaron Dynamics of CMR Manganites
• Reentrant Orbital Order and the True Ground State of LaSr2Mn2O7
• Small-polaron hopping conductivity in bilayer manganite La${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
• Polaronic metal phases in La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$ uncovered by inelastic neutron and x-ray scattering
• Large lattice distortions associated with the magnetic transition in La0.7Sr0.3MnO3
• Response of acoustic phonons to charge and orbital order in the 50\% doped bilayer manganite LaSr${}_2$Mn${}_2$O${}_7$
• Interacting chains of orbital polarons in "Colossal" magnetoresistive La1-xSrxMnO3 revealed by spin and lattice dynamics

Cited by in corpus (3)

• Damping and softening of transverse acoustic phonons in colossal magnetoresistive La${}_{0.7}$Ca${}_{0.3}$MnO${}_3$ and La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$
• Interacting chains of orbital polarons in "Colossal" magnetoresistive La1-xSrxMnO3 revealed by spin and lattice dynamics
• Strongly anharmonic collective modes in a coupled electron-phonon-spin problem