Visualization of Localized Holes in Manganite Thin Films with Atomic Resolution

X., J.; Gillaspie, Dane T.; Plummer, E. W.; Shen, Jian

doi:10.1103/physrevlett.95.237210

Cited by 58 publications

(40 citation statements)

References 31 publications

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“…As in prior STM/STS work on electronically inhomogeneous manganites, [24][25][26][27][28] contiguous nanoscale regions of similar differential conductance are evident, conductive clusters forming in an insulating matrix. The extent of this inhomogeneity is reinforced by Fig.…”

Section: (001)mentioning

confidence: 63%

Direct real space observation of magneto-electronic inhomogeneity in ultra-thin film La0.5Sr0.5CoO3−δ on SrTiO3(001)

Kelly

Galli

Aarts

et al. 2014

Applied Physics Letters

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Recent magnetotransport and neutron scattering measurements implicate interfacial magneto-electronic phase separation as the origin of the degradation in transport and magnetism in ultra-thin film La1−xSrxCoO3 on SrTiO3(001). Here, using low temperature scanning tunneling microscopy and spectroscopy the first direct, real space observation of this nanoscopic electronic inhomogeneity is provided. Films of thickness 12.4 nm (32 unit cells) are found to exhibit spatially uniform conductance, in stark contrast to 4.7 nm (12 unit cell) films that display rich variations in conductance, and thus local density of states. The electronic heterogeneity occurs across a hierarchy of length scales (5–50 nm), with complex correlations with both topography and applied magnetic fields. These results thus provide a direct observation of magneto-electronic inhomogeneity in SrTiO3(001)/La0.5Sr0.5CoO3 at thicknesses below 6–7 nm, in good agreement with less direct techniques.

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Section: (001)mentioning

confidence: 63%

Direct real space observation of magneto-electronic inhomogeneity in ultra-thin film La0.5Sr0.5CoO3−δ on SrTiO3(001)

Kelly

Galli

Aarts

et al. 2014

Applied Physics Letters

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“…4c,e). Although the Ca doping ratio in our experimental system case is 3/8, it has been observed that this kind of CE-type state still exists 22,23 . The only difference is that the CE-type state in 3/8 Ca-doping system is weaker and easier to be disturbed owing to the doping offset to its optimized half doping, which will benefit the emergence of ferromagnetic edge states.…”

Section: Resultsmentioning

confidence: 99%

Visualization of a ferromagnetic metallic edge state in manganite strips

Zhang

Dong

et al. 2015

Nat Commun

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Recently, broken symmetry effect induced edge states in two-dimensional electronic systems have attracted great attention. However, whether edge states may exist in strongly correlated oxides is not yet known. In this work, using perovskite manganites as prototype systems, we demonstrate that edge states do exist in strongly correlated oxides. Distinct appearance of ferromagnetic metallic phase is observed along the edge of manganite strips by magnetic force microscopy. The edge states have strong influence on the transport properties of the strips, leading to higher metal-insulator transition temperatures and lower resistivity in narrower strips. Model calculations show that the edge states are associated with the broken symmetry effect of the antiferromagnetic charge-ordered states in manganites. Besides providing a new understanding of the broken symmetry effect in complex oxides, our discoveries indicate that novel edge state physics may exist in strongly correlated oxides beyond the current two-dimensional electronic systems.

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“…The absence of a reconstruction indicates that indeed no oxygen-vacancy induced reconstructions exist at the surface. Atomically ordered single crystalline films have been produced routinely using similar procedures in our lab 26,27 . After growth the sample was transferred to a connecting variable temperature scanning tunneling microscopy (STM) chamber without breaking ultra-high vacuum.…”

Section: Resultsmentioning

confidence: 99%

A persistent metal–insulator transition at the surface of an oxygen-deficient, epitaxial manganite film

et al. 2013

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The oxygen stoichiometry has a large influence on the physical and chemical properties of complex oxides. Most of the functionality in e.g. catalysis and electrochemistry depends in particular on control of the oxygen stoichiometry. In order to understand the fundamental properties of intrinsic surfaces of oxygen-deficient complex oxides, we report on in situ temperature dependent scanning tunnelling spectroscopy experiments on pristine oxygen deficient, epitaxial manganite films. Although these films are insulating in subsequent ex situ in-plane electronic transport experiments at all temperatures, in situ scanning tunnelling spectroscopic data reveal that the surface of these films exhibits a metalinsulator transition (MIT) at 120 K, coincident with the onset of ferromagnetic ordering of small clusters in the bulk of the oxygen-deficient film. The surprising proximity of the surface MIT transition temperature of nonstoichiometric films with that of the fully oxygenated bulk suggests that the electronic properties in the surface region are not significantly affected by oxygen deficiency in the bulk. This carries important implications for the understanding and functional design of complex oxides and their interfaces with specific electronic properties for catalysis, oxide electronics and electrochemistry.In catalysis and electrochemistry the surface properties of catalyst and electrode materials dominate their functional performance. For oxide materials this is often associated with the bulk oxygen stoichiometry, with oxygen vacancies frequently improving the catalytic and electrochemical performance 1, 2 . This contrasts with the spectacular physical properties with promising functionality displayed by complex oxides such as perovskites [3][4][5][6] but that are generally strongly reduced or even eliminated by the introduction of oxygen vacancies 7 . Moreover, in nanoscale oxide heterostructures the possible large chemical and electrostatic potential gradients, and the high surface/volume ratios may drastically affect the properties of the material 8 . With respect to the chemically important surface properties, it is currently not clear whether an oxygen deficiency in the bulk of a three-dimensional (3D) perovskite affects these surface properties in concert with those of the bulk, or whether this is significantly different due to eg. altered oxygen vacancy formation energies near the surface due to different local ionic coordination or even a different local stoichiometry of the unit cells at the surface and interface. Complicating our understanding of the electronic properties of catalytically relevant complex oxide surfaces is the fact that at their surfaces and interfaces the broken translational symmetry fundamentally changes the properties 9, 10 . While this has been shown to produce remarkable physics at interfaces [11][12][13] , at surfaces of three-dimensional (3D) perovskites the results are qualitatively different: many fully oxygenated 3D perovskite surfaces and interfaces exhibit a so-cal...

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Visualization of Localized Holes in Manganite Thin Films with Atomic Resolution

Cited by 58 publications

References 31 publications

Direct real space observation of magneto-electronic inhomogeneity in ultra-thin film La0.5Sr0.5CoO3−δ on SrTiO3(001)

Direct real space observation of magneto-electronic inhomogeneity in ultra-thin film La0.5Sr0.5CoO3−δ on SrTiO3(001)

Visualization of a ferromagnetic metallic edge state in manganite strips

A persistent metal–insulator transition at the surface of an oxygen-deficient, epitaxial manganite film

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