Bilayer manganites: polarons in the midst of a metallic breakdown

Abstract

The exact nature of the low temperature electronic phase of the manganite materials family, and hence the origin of their colossal magnetoresistant (CMR) effect, is still under heavy debate. By combining new photoemission and tunneling data, we show that in La{2-2x}Sr{1+2x}Mn2O7 the polaronic degrees of freedom win out across the CMR region of the phase diagram. This means that the generic ground state is that of a system in which strong electron-lattice interactions result in vanishing coherent quasi-particle spectral weight at the Fermi level for all locations in k-space. The incoherence of the charge carriers offers a unifying explanation for the anomalous charge-carrier dynamics seen in transport, optics and electron spectroscopic data. The stacking number N is the key factor for true metallic behavior, as an intergrowth-driven breakdown of the polaronic domination to give a metal possessing a traditional Fermi surface is seen in the bilayer system.

7 pages, 2 figures, includes supplementary information

References in corpus (19)

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• Quasiparticle-like peaks, kinks, and electron-phonon coupling at the ($\pi$,0) regions in the CMR oxide La${}_{2-2x}$Sr${}_{1+2x}$Mn${}_2$O${}_7$
• Photoemission spectra of LaMnO3 controlled by orbital excitations
• Imaging Oxygen Defects and their Motion at a Manganite Surface
• The Structure of Nanoscale Polaron Correlations in La1.2Sr1.8Mn2O7
• A local metallic state in globally insulating $L{a}_{1.24}S{r}_{1.76}M{n}_2{O}_7$ well above the metal-insulator transition
• Suppressed Magnetization at the Surfaces and Interfaces of Ferromagnetic Metallic Manganites
• Orbitally induced string formation in the spin-orbital polarons
• Reentrant Orbital Order and the True Ground State of LaSr2Mn2O7
• 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 $x=0.36$
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• Bridging charge-orbital ordering and Fermi surface instabilities in half-doped single-layered manganite La_0.5Sr_1.5MnO_4
• A high resolution, hard x-ray photoemission investigation of La_(2-2x)Sr_(1+2x)Mn_2O_7 (0.30<x<0.50): on microscopic phase separation and the surface electronic structure of a bilayered CMR manganite

Cited by in corpus (18)

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• Holographic Polarons, the Metal-Insulator Transition and Massive Gravity
• Quantum many-body interactions in digital oxide superlattices
• Local orbital degeneracy lifting as a precursor to an orbital-selective Peierls transition
• Lattice potentials and fermions in holographic non Fermi-liquids: hybridizing local quantum criticality
• Polaronic metal phases in La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$ uncovered by inelastic neutron and x-ray scattering
• Isotropic Kink and Quasiparticle Excitations in the Three-Dimensional Perovskite Manganite La${}_{0.6}$Sr${}_{0.4}$MnO${}_3$
• Correlated singlet phase in the one-dimensional Hubbard-Holstein model
• Etching of Cr tips for scanning tunneling microscopy of cleavable oxides
• Low temperature dynamic polaron liquid in a manganite exhibiting colossal magnetoresistance
• An analysis of the $t_2-V$ model
• Study of supersolidity in the two-dimensional Hubbard-Holstein model
• Observation of electronic inhomogeneity and charge density wave in a bilayer La${}_{1.36}$Sr${}_{1.64}$Mn${}_2$O${}_7$ single crystal
• Temperature and Field Dependence of Magnetic Domains in La${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
• Cooling a polaronic liquid: Phase mixture and pseudogap-like spectra in superconducting $B{a}_{1-x}{K}_{x}Bi{O}_3$
• Phase diagram of Hubbard-Holstein model on 4-leg tube system at quarter-filling
• On the origin of CE-type orbital fluctuations in the ferromagnetic metallic La${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$