Direct Observation of High-Temperature Polaronic Behavior In Colossal Magnetoresistive Manganites

Abstract

The temperature dependence of the electronic and atomic structure of the colossal magnetoresistive oxides $L{a}_{1-x}S{r}_{x}Mn{O}_3$ (x = 0.3, 0.4) has been studied using core and valence level photoemission, x-ray absorption and emission, and extended x-ray absorption fine structure spectroscopy. A dramatic and reversible change of the electronic structure is observed on crossing the Curie temperature, including charge localization and spin moment increase of Mn, together with Jahn-Teller distortions, both signatures of polaron formation. Our data are also consistent with a phase-separation scenario.

5 pages, 4 figures, revtex

References in corpus (5)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• 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 $L{a}_{1-x}{A}_{x}Mn{O}_3$
• Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities
• Intrinsic chemical and structural inhomogeneity in lightly doped La(1-x)Sr(x)MnO(3)

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• Temperature-Dependent X-Ray Absorption Spectroscopy of Colossal Magnetoresistive Perovskites
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• Percolative phase transition on ferromagnetic insulator manganites: uncorrelated to correlated polaron clusters
• Numerical study of the isotope effect in underdoped high-temperature superconductors: Calculation of the angle-resolved photoemission spectra
• Local distortion of MnO${}_6$ octahedron in La${}_{1-x}$Sr${}_x$MnO${}_{3+\delta }$ (x = 0.1 to 0.9): an EXAFS study
• Relationship between macroscopic physical properties and local distortions of low doping La{1-x}Ca{x}MnO3: an EXAFS study
• Uncorrelated and correlated nanoscale lattice distortions in the paramagnetic phase of magnetoresistive manganites
• Chemical potential shift induced by double-exchange and polaronic effects in Nd_{1-x}Sr_xMnO_3
• Diagrammatic content of the DMFT for the Holstein polaron problem in finite dimensions
• Direct Observation of Spectroscopic Inhomogeneities on La0.7Sr0.3MnO3 Thin Films by Scanning Tunnelling Spectroscopy
• Coherence of polaronic transport in layered metals