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Thin Films and Interfaces Group

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Scientific Highlights

Scientific Highlights

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Datum
14 October 2014
Temperature dependence of the (050) reflection from a 200 nm o−LuMnO3 [110]-oriented film. Inset (a): Temperature dependence of the integrated intensity from the (050) structural reflection (black) and the (0qb≈½0) magnetic reflection (red) of this film. Inset (b): The simplest approximation for a distortion producing nonzero intensity for a (0k0) reflection with k odd, depicted for two atoms along the b direction.

Multiferroic Properties of o−LuMnO3 Controlled by b-Axis Strain

Strain is a leading candidate for controlling magnetoelectric coupling in multiferroics. Here, we use x-ray diffraction to study the coupling between magnetic order and structural distortion in epitaxial films of the orthorhombic (o-) perovskite LuMnO3. An antiferromagnetic spin canting in the E-type magnetic structure is shown to be related to the ferroelectrically induced structural distortion and to a change in the magnetic propagation vector.

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1 September 2014
Sr, Mn, and O content in La0.6SrxMnyO3-Δ thin films: (a) deposited on (001) SrTiO3 substrate at 650 °C as a function of the O2 background pressure using an ablation fluence of 1.8 J/cm2; (b) deposited on (001) Si substrate at room temperature as a function of the O2 background pressure using an ablation fluence of 1.8 J/cm2.

Plasma interactions determine the composition in pulsed laser deposited thin films

Plasma chemistry and scattering strongly affect the congruent, elemental transfer during pulsed laser deposition of target metal species in an oxygen atmosphere. Studying the plasma properties of La0.6Sr0.4MnO3, we demonstrate for as grown La0.6Sr0.4MnO3-δ films that a congruent transfer of metallic species is achieved in two pressure windows: ∼10−3 mbar and ∼2 × 10−1 mbar.

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1 September 2014
Possible reactions at the cathode using (a) a mixed O2- ion/e− conductor, (b) a mixed H+/e− conductor, and (c) a composite cathode made of a proton conductor phase and a mixed O2–/e− conductor phase. The dark gray spheres represent a mixed O2–/e− conductor phase, the light blue sphere is a mixed H+/e– conductor, while the light gray sphere is a H+ conductor. The red semicircles represent the reaction sites where the oxygen reduction takes place.

Low-temperature solid-oxide fuel cells based on proton-conducting electrolytes

The need for reducing the operating temperature of solid-oxide fuel cells (SOFCs) imposed by cost reduction has pushed significant progress in fundamental understanding of the individual components, as well as materials innovation and device engineering. Proton-conducting oxides have emerged as potential alternative electrolyte materials to oxygen-ion conducting oxides for operation at low and intermediate temperatures.

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12 February 2014
(a) RIXS map of La2Ti2O7; (b) extracted spectra of HR-XAS (red) and valence-to-core XES (blue); (c) FEFF calculated orbital contribution.

Determination of conduction and valence band electronic structure of La2Ti2O7 thin film

The electronic structure of a La2Ti2O7-layered perovskite thin film was determined by resonant inelastic X-ray scattering (RIXS) measurements and FEFF calculations. It was found that the empty Ti and La d-band states dominate the conduction band of the structure, whereas the top edge of the valence band is mainly composed of filled O-p states. Furthermore, there is a pronounced overlap between occupied La-p states and O-s states, which are located deeper in the valence band.

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Thin Films and Interfaces Group
Paul Scherrer Institut
5232 Villigen PSI
Switzerland
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Professor Dr. Dr. h.c. Thomas Lippert
Head of Group
OFLB/U110
tel: +41 56 310 4076
fax: +41 56 310 2688
thomas.lippert@psi.ch

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