Materials Literature
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We observed well-defined oscillations of speckle intensities from Pt (001) surfaces at high temperatures, persisting for tens of minutes. We used a model of hex-reconstructed terraces to show that the coherent x-rays reflected from the terraces retain their phases relative to the illumination boundary and the observed…
The dielectric tensor and lattice dynamics of $\ensuremath{\alpha}$-PbO${}_{2}$-type TiO${}_{2}$ have been investigated using density functional perturbation theory, with a focus on responses of the vibrational frequencies to pressure. The calculated Raman spectra under different pressures are in good agreement with a…
Frustrated magnetic systems exhibit highly degenerate ground states and strong fluctuations, often leading to new physics. An intriguing example of current interest is the antiferromagnet on a diamond lattice, realized physically in A-site spinel materials. This is a prototypical system in three dimensions where frust…
We report structurally tuned superconductivity in a ${\mathrm{K}}_{x}{\mathrm{Fe}}_{2\ensuremath{-}y}{\mathrm{Se}}_{2\ensuremath{-}z}{\mathrm{S}}_{z}$ ($0\ensuremath{\le}z\ensuremath{\le}2$) phase diagram. Superconducting ${T}_{c}$ is suppressed as S is incorporated into the lattice, eventually vanishing at 80% of S.…
To enhance the kinetics and overall production of renewable H 2 fuel through a two-step thermochemical water splitting cycle, three-dimensionally ordered macroporous (3DOM) Ce 1– x Zr x O 2 ( x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5) materials were synthesized via colloidal crystal templating. The interconnected macropore s…
We report a ferroelectric transition driven by the off-centering of magnetic Mn(4+) ions in antiferromagnetic Mott insulators Sr(1-x)Ba(x)MnO(3) with a perovskite structure. As x increases, the perovskite lattice shows the typical soft-mode dynamics, as revealed by the momentum-resolved inelastic x-ray scattering and…
We consider RKKY interaction between two magnetic impurities in graphene. The consideration is based on the perturbation theory for the thermodynamic potential in the imaginary time representation. We analyze the symmetry of the RKKY interaction on the bipartite lattice at half filling. Our analytical calculation of t…
We report the observation of magnetoelectric and magnetodielectric effects at different temperatures in Mn-substituted yttrium orthoferrite, ${\mathrm{YFe}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}{\mathrm{O}}_{3}(0.1\ensuremath{\le}x\ensuremath{\le}0.40)$. Substitution of Mn in antiferromagnetic ${\mathrm{YFeO}}_{3}({T}_{…
We present a comprehensive study of enhanced light funneling through a subwavelength aperture with realistic (lossy) epsilon-near-zero (ENZ) materials. We realize experimentally an inclusion-free ENZ material layer operating at optical frequencies and characterize its performance. An analytical expression describing l…
Single-crystal neutron diffraction studies on superconductors ${A}_{2}{\mathrm{Fe}}_{4}{\mathrm{Se}}_{5}$, where $A=\mathrm{Rb}$, Cs, (Tl, Rb), and (Tl, K) (${T}_{c}\ensuremath{\sim}30\text{ }\text{ }\mathrm{K}$), uncover the same Fe vacancy ordered crystal structure and the same block antiferromagnetic order as in ${…
We report on an investigation of quasi-free-standing graphene on 6H-SiC(0001) which was prepared by intercalation of hydrogen under the buffer layer. Using infrared absorption spectroscopy, we prove that the SiC(0001) surface is saturated with hydrogen. Raman spectra demonstrate the conversion of the buffer layer into…
Since the first report on the far-field optical detection of single metal nanoparticles in the late 1990s, the field has rapidly developed and new methods and concepts have been introduced. Eliminating averaging over the broad size, shape and crystallinity distributions produced by even the best of current synthesis m…
We designed a Pb-free pseudo-binary system, Ba(Sn0.12Ti0.88)O3-x(Ba0.7Ca0.3)O3 (BTS-xBCT), characterized by a phase boundary starting from a tricritical triple point of a paraelectric cubic phase, ferroelectric rhombohedral, and tetragonal phases. The optimal composition BTS-30BCT exhibits a high piezoelectric coeffic…
Colloidal semiconductor quantum dots (QDs) have evolved beyond scientific novelties and are transitioning into bona fide analytical tools. We describe the burgeoning role of QDs in many different fields of bioanalyses and highlight the advantages afforded by their unique physical and optical properties.
Nanotechnology is expected to play a vital role in the rapidly developing field of nanomedicine, creating innovative solutions and therapies for currently untreatable diseases, and providing new tools for various biomedical applications, such as drug delivery and gene therapy. In order to optimize the efficacy of nano…
The effects of residues introduced during the transfer of chemical vapor deposited graphene from a Cu substrate to an insulating (SiO2) substrate on the physical and electrical of the transferred graphene are studied. X-ray photoelectron spectroscopy and atomic force microscopy show that this residue can be substantia…
Experiments on corrosive wear showed that the wear is severe when the coolant temperature is below 60 °C. It can be minimised by selection of low sulfur fuel, lubricating oil with proper corrosion inhibiting additives and, most importantly, by a thermostat assembly to maintain the coolant temperature in the range of 7…
International audience
International audience
International audience