Reentrant Orbital Order and the True Ground State of LaSr2Mn2O7

Abstract

Contrary to conventional wisdom, our purified La2-2xSr1+2xMn2O7 crystals exhibit CE-type orbital and charge order as the low-temperature ground state for a hole doping level h = 0.5. For small deviations from h = 0.5, the high temperature CE phase is replaced at low temperatures by an A-type antiferromagnet without coexistence. Larger deviations result in a lack of CE order at any temperature. Thus, small inhomogeneities in cation or oxygen composition could explain why others commonly see this reentrance with coexistence.

4 pages, RevTex4

References in corpus (5)

• Interplay of spin and orbital ordering in the layered colossal magnetoresistance manganite La2-2xSr1+2xMn2O7 (0.5<=x<=1.0)
• Charge Ordering and Phase Competition in the Layered Perovskite Lasr2mn2o7
• Interplay of the CE-type charge ordering and the A-type spin ordering in a half-doped bilayer manganite La{1}Sr{2}Mn{2}O{7}
• Variable-range-hopping conductivity of half-doped bilayer manganite LaSr${}_2$Mn${}_2$O${}_7$
• Resonant X-ray Study on the Bi-Layered Perovskite Mn Oxide LaSr2Mn2O7

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• Electron-lattice coupling and partial nesting as the origin of Fermi-Arcs in manganites
• Polaronic metal phases in La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$ uncovered by inelastic neutron and x-ray scattering
• Changeover from Glassy ferromagnetism of the orbital domain state to long range ferromagnetic ordering in La{_{0.9}}Sr_{0.1}MnO{_3}
• d-d Excitations in Bilayer Manganites Probed by Resonant Inelastic X-ray Scattering
• Response of acoustic phonons to charge and orbital order in the 50\% doped bilayer manganite LaSr${}_2$Mn${}_2$O${}_7$
• Polaronic correlations and phonon renormalization in La1-xSrxMnO3 (x = 0.2, 0.3)
• Evidence of photo-induced dynamic competition of metallic and insulating phase in a layered manganite
• CE-antiferromagnetic electronic structure in LaSr${}_2$Mn${}_2$O${}_7$ revealed by micro-focused angle-resolved photoemission spectroscopy and tight-binding models
• Dynamics of bi-stripes and a colossal metal-insulator transition in the bi-layer manganite La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$ (x~0.59)