Atomic-scale images of charge ordering in a mixed-valence manganite

Abstract

Transition-metal perovskite oxides exhibit a wide range of extraordinary but imperfectly understood phenomena. Charge, spin, orbital, and lattice degrees of freedom all undergo order-disorder transitions in regimes not far from where the best-known of these phenomena, namely high-temperature superconductivity of the copper oxides, and the 'colossal' magnetoresistance of the manganese oxides, occur. Mostly diffraction techniques, sensitive either to the spin or the ionic core, have been used to measure the order. Unfortunately, because they are only weakly sensitive to valence electrons and yield superposition of signals from distinct mesoscopic phases, they cannot directly image mesoscopic phase coexistence and charge ordering, two key features of the manganites. Here we describe the first experiment to image charge ordering and phase separation in real space with atomic-scale resolution in a transition metal oxide. Our scanning tunneling microscopy (STM) data show that charge order is correlated with structural order, as well as with whether the material is locally metallic or insulating, thus giving an atomic-scale basis for descriptions of the manganites as mixtures of electronically and structurally distinct phases.

8 pages, 4 figures, 19 references

References in corpus (2)

• Discovery of microscopic electronic inhomogeneity in the high-Tc superconductor Bi2Sr2CaCu2O8+x
• Inherent Inhomogeneities in Tunneling Spectra of BSCCO Crystals in the Superconducting State

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• Modelling colossal magnetoresistance manganites
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• Imaging Oxygen Defects and their Motion at a Manganite Surface
• Insulator to Metal Transition Induced by Disorder in a Model for Manganites
• Microscopic modelling of doped manganites
• Chemical potential shift and spectral weight transfer in Pr${}_{1-x}$Ca${}_x$MnO${}_3$ revealed by photoemission spectroscopy
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• Effect of inhomogeneity on s-wave superconductivity in the attractive Hubbard model
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• Nanoscale Phase Coexistence and Percolative Quantum Transport
• Incommensurate Spin Ordering and Fluctuations in underdoped La_{2-x}Ba_{x}CuO_{4}
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• Arrested phase separation in double-exchange models: machine-learning enabled large-scale simulation
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• Doping Dependence of Two Energy Scales in the Tunneling Spectra of Superconducting La${}_{2-x}$Sr${}_x$CuO${}_4$
• Charge and Orbital Ordering in Pr_{0.5} Ca_{0.5} MnO_3 Studied by ^{17}O NMR
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• Images of metallic and insulating domains on the surface of a (La0.4Pr0.6)0.67Ca0.33MnO3 film
• Low-Temperature Glassy Response of Ultrathin Manganite Films to Electric and Magnetic Fields
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• Dynamics of Phase Separated States in the Double Exchange Model
• Characterization of Disorder in Semiconductors via Single-Photon Interferometry
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• Physical meaning and measurement of the entropic parameter $q$ in an inhomogeneous magnetic systems
• Disorder Induced Cluster Formation near First Order Phase Transitions in Electronic Systems: Importance of Long-Range Coulomb Interaction
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• Spin-polarized tunneling spectroscopic studies of the intrinsic heterogeneity and pseudogap phenomena in colossal magnetoresistive manganite La_{0.7}Ca_{0.3}MnO_{3}
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• Temperature and Field Dependence of Magnetic Domains in La${}_{1.2}$Sr${}_{1.8}$Mn${}_2$O${}_7$
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• Evidence of mobile carriers with Charge Ordering gap in Epitaxial Pr${}_{0.625}$Ca${}_{0.375}$MnO${}_3$ Thin Films
• Phonon-assisted phase separation in strongly correlated systems
• Machine-learning force-field models for dynamical simulations of metallic magnets
• Machine-learning modeling of magnetization dynamics in quasi-equilibrium and driven metallic spin systems