The next 25 years of surface physics

Plummer, E. W.

doi:10.1016/s0079-6816(01)00014-4

Cited by 19 publications

(7 citation statements)

References 46 publications

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“…Note that in contrast to Ref. 12, our data reveal well resolved surfaces and steps, both above and below the COO temperature, T COO = 230 K. The measured roughness of the terraces, observed in our data, was usually 0.1 nm, indicating previous assessments (0.6 nm) [10,12] to be largely overestimated. A large defect-free portion of the surface is revealed by the atomically resolved STM image is shown in Fig.…”

contrasting

confidence: 99%

Bridging Charge-Orbital Ordering and Fermi Surface Instabilities in Half-Doped Single-Layered ManganiteLa0.5Sr1.5MnO4

et al. 2010

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PACS numbers:Density waves are inherent to the phase diagrams of materials that exhibit unusual, and sometimes extraordinarily useful properties, such as superconductivity and colossal magnetoresistance [1, 2, 3, 4]. While the pure charge density waves (CDW) are well described by an itinerant approach [5, 6], where electrons are treated as waves propagating through the crystal, the charge-orbital ordering (COO) is usually explained by a local approach [7], where the electrons are treated as localized on the atomic sites. Here we show that in the half-doped manganite La 0.5 Sr 1.5 MnO 4 (LSMO) the electronic susceptibility, calculated from the angle-resolved photoemission spectra (ARPES), exhibits a prominent nesting-driven peak at one quarter of the Brillouin zone diagonal, that is equal to the reciprocal lattice vector of the charge-orbital pattern. Our results demonstrate that the Fermi surface geometry determines the propensity of the system to form a COO state which, in turn, implies the applicability of the itinerant approach also to the COO.

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confidence: 99%

Bridging Charge-Orbital Ordering and Fermi Surface Instabilities in Half-Doped Single-Layered ManganiteLa0.5Sr1.5MnO4

et al. 2010

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“…The latter depend on bias polarity (see supplementary figure S1) and therefore have an electronic component, most likely due to charge inhomogeneities (mixed Mn valence and/or cation distribution). These features are similar to the surface inhomogeneities observed on the La 0.5 Sr 1.5 MnO 4 surface by STM [21,22] and surface x-ray scattering [23].…”

Section: Atomicsupporting

confidence: 81%

Imaging oxygen defects and their motion at a manganite surface

et al. 2011

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manganites are technologically important materials, used widely as solid oxide fuel cell cathodes; they have also been shown to exhibit electroresistance. oxygen bulk diffusion and surface exchange processes are critical for catalytic action, and numerous studies of manganites have linked electroresistance to electrochemical oxygen migration. Direct imaging of individual oxygen defects is needed to underpin understanding of these important processes. Currently, it is not possible to collect the required images in bulk, but scanning tunnelling microscopy (sTm) could provide such data for surfaces. Here, we report the first atomic resolution images of oxygen defects at a manganite surface. our experiments also reveal defect dynamics, including oxygen adatom migration, vacancy-adatom recombination and adatom bistability. Beyond providing an experimental basis for testing models describing the microscopics of oxygen migration at transition-metal oxide interfaces, our work resolves the long-standing puzzle of why sTm is more challenging for layered manganites than for cuprates.

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“…As discussed by Willmott, 1 most of the new technological interesting materials have a complex chemical and crystalline structure. A similar message to the scientific community is given by Plummer et al 2 An example of the increased complexity is the use of the complex metal oxide thin films. These coatings find application as corrosion and wear resistant coatings, 3,4 high-k dielectrics, 5,6 solid state ionic conductors in solid oxide fuel cells, [7][8][9][10] or thin film batteries.…”

Section: Introductionmentioning

confidence: 77%

Compositional effects on the growth of Mg(M)O films

Saraiva

Georgieva

Mahieu

et al. 2010

Journal of Applied Physics

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The influence of the composition on the crystallographic properties of deposited Mg(M)O (with M=Al, Cr, Ti, Y, and Zr) films is studied. For a flexible control of the composition, dual reactive magnetron sputtering was used as deposition technique. Two different approaches to predict the composition are discussed. The first is an experimental way based on the simple relationship between the deposition rate and the target-substrate distance. The second is a route using a Monte Carlo based particle trajectory code. Both methods require a minimal experimental input and enable the user to quickly predict the composition of complex thin films. Good control and flexibility allow us to study the compositional effects on the growth of Mg(M)O films. Pure MgO thin films were grown with a (111) preferential out-of-plane orientation. When adding M to MgO, two trends were noticed. The first trend is a change in the MgO lattice parameters compared to pure MgO. The second tendency is a decrease in the crystallinity of the MgO phase. The experimentally determined crystallographic properties are shown to be in correspondence with the predicted properties from molecular dynamics simulations

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The next 25 years of surface physics

Cited by 19 publications

References 46 publications

Bridging Charge-Orbital Ordering and Fermi Surface Instabilities in Half-Doped Single-Layered ManganiteLa0.5Sr1.5MnO4

Bridging Charge-Orbital Ordering and Fermi Surface Instabilities in Half-Doped Single-Layered ManganiteLa0.5Sr1.5MnO4

Imaging oxygen defects and their motion at a manganite surface

Compositional effects on the growth of Mg(M)O films

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