The Structure of Nanoscale Polaron Correlations in La1.2Sr1.8Mn2O7

Abstract

A system of strongly-interacting electron-lattice polarons can exhibit charge and orbital order at sufficiently high polaron concentrations. In this study, the structure of short-range polaron correlations in the layered colossal magnetoresistive perovskite manganite, La1.2Sr1.8Mn2O7, has been determined by a crystallographic analysis of broad satellite maxima observed in diffuse X-ray and neutron scattering data. The resulting q=(0.3,0,1) modulation is a longitudinal octahedral-stretch mode, consistent with an incommensurate Jahn-Teller-coupled charge-density-wave fluctuations, that implies an unusual orbital-stripe pattern parallel to the <100> directions.

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• Polarons and confinement of electronic motion to two dimensions in a layered transition metal oxide
• Glass Transition in the Polaron Dynamics of CMR Manganites
• Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of collective excitation mode in Pr${}_{\text{0.7}}$Ca${}_{\text{0.3}}$MnO${}_{\text{3}}$ by using THz time-domain spectroscopy
• Polaron Coherence Condensation as the Mechanism for Colossal Magnetoresistance in Layered Manganites
• Bilayer manganites: polarons in the midst of a metallic breakdown
• Average Lattice Symmetry and Nanoscale Structural Correlations in Magnetoresistive Manganites
• Competing crystal structures in La0.5Ca0.5MnO3: conventional charge order versus Zener polarons
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• Electron-lattice coupling and partial nesting as the origin of Fermi-Arcs in manganites
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• Orbital mixing and nesting in the bilayer manganites La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$
• Non-gapped Fermi surfaces, quasiparticles and the anomalous temperature dependence of the near-$E_F$ electronic states in the CMR oxide La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$ with $x=0.36$
• Magnetic momentum density, Fermi surface and directional magnetic Compton profiles in LaSr${}_2$Mn${}_2$O${}_7$ and La${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
• Low temperature dynamic polaron liquid in a manganite exhibiting colossal magnetoresistance
• Response of acoustic phonons to charge and orbital order in the 50\% doped bilayer manganite LaSr${}_2$Mn${}_2$O${}_7$
• Absence of charge-density-wave sliding in epitaxial charge-ordered Pr0.48Ca0.52MnO3 films
• Collective Phase-like Mode and the Role of Lattice Distortions at TN~TC in RMn2O5 (R= Pr, Sm, Gd, Tb, Bi)
• Observation of electronic inhomogeneity and charge density wave in a bilayer La${}_{1.36}$Sr${}_{1.64}$Mn${}_2$O${}_7$ single crystal
• Magnetization Distribution in the layered CMR Manganite La1.2Sr1.8Mn2O7 from Polarized Neutron Diffraction