Materials Literature
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The first fully structurally characterized ternary europium palladium hydrides (deuterides) are reported. The most Eu rich compound is Eu(2)PdD(4). Its beta-K(2)SO(4) type structure (space group Pnma, a = 749.47(1) pm, b = 543.34(1) pm, c = 947.91(1) pm, Z = 4) contains tetrahedral 18-electron [PdD(4)](4)(-) complex a…
The structure of a tetragonal crystal form of thiostrepton has been solved using the anomalous dispersive effects of five S atoms from high-redundancy data collected to 1.33 A resolution at the Cu Kalpha wavelength. Data measured to 1.02 A resolution with a synchrotron source were used for refinement. Details of the m…
A diffraction data set has been collected from a blood coagulation factor XIII-Ca(2+) complex crystal at the X-ray diffraction beamline of the ELETTRA synchrotron (Trieste, Italy) at a wavelength of 2.6 A. The data collection could be carried out using the beamline as is, without making any time-consuming changes to t…
Electron spin resonance, pulsed electron nuclear double resonance (ENDOR) spectroscopy at W- and X-band frequencies, and hyperfine sublevel correlation (HYSCORE) spectroscopy have been employed to determine the location of the V(IV) ions in H4PVMo11O40 heteropolyacid catalysts. In these materials the heteropolyanions…
The behavior of the tripeptides tri- l -alanine and tri- l -leucine, deposited under ultrahigh vacuum conditions onto a clean Cu{110} surface, has been studied using reflection−absorption infrared spectroscopy and low-energy electron diffraction. Both peptides remain intact upon landing on the Cu{110}surface and are p…
Transport properties of mixed-valence manganites of the type $({\mathrm{La}}_{0.7\ensuremath{-}x}{R}_{x}){\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ where $R=\mathrm{Ho}$ (magnetic) and Y (nonmagnetic) have been investigated above the ferromagnetic transition temperature ${(T}_{C}).$ It is interesting to see that the Ho-do…
The crystal structure of a mutant of bovine pancreatic trypsin inhibitor has been refined to 0.86 A resolution using low-temperature synchrotron data. The variant contains three mutations in the binding loop (Thr11Ala, Pro13Ala, Lys15Arg) and an unrelated Met52Leu substitution. Refinement with anisotropic displacement…
Calcium sulfate dihydrate primary nucleation was experimentally studied in a batch crystallizer with a related optical device at a supersaturation ranging from 2 to 4 and a fixed temperature T = 25 °C. The mother liquor was supersaturated with calcium sulfate in which calcium or sodium chloride salts were added to app…
Polarization-resolved magnetophotoluminescence spectroscopy is used to study exciton spin states in 40--80 \AA{} diameter chemically synthesized CdSe quantum dots (QDs) at temperatures $T=1.2--50\mathrm{K}.$ The spin polarization is found not to saturate in magnetic fields to 60 T and time-resolved studies indicate a…
Examination on the existence of the critical and primary crystallite size ( d c α ∼ 17 nm and d p = 50−55 nm) phenomena during θ- to α-phase transformation of the nanosized Al 2 O 3 powder was designed and conducted using two θ-Al 2 O 3 powders of different crystallite sizes. Due to the critical size, the size depende…
We explain the reduction of the thermal conductance below the predicted universal value observed by Schwab et al. [Nature (London) 404, 974 (2000)] in terms of the scattering of thermal phonons off surface roughness using a scalar model for the elastic waves. Our analysis shows that the thermal conductance depends on…
Crystallization is a unique process that occurs at the expense of entropy, including the conformational entropy of surface residues, which become ordered in crystal lattices during formation of crystal contacts. It could therefore be argued that epitopes free of amino acids with high conformational entropy are more th…
Nonblended poly(L-lactide) (PLLA) films having different molecular weights and nonblended poly(lactide) (PLA) films, enantiomeric blend films from PLLA and poly(D-lactide) (PDLA), and diastereoisomeric blend films of poly(DL-lactide) (PDLLA) with either PLLA or PDLA, having different L-lactide (LLA) contents (X(LLA)s)…
Complex materials are known to show two regions of ac electrical behavior. In the high-temperature/low-frequency domain, they show power-law frequency dependence of the conductivity known as ``universal dielectric response,'' or UDR, while at low temperatures/high frequencies they show ``nearly constant loss,'' or NCL…
Using the point-contact Andreev reflection technique, we have carried out a systematic study of the spin polarization in the colossal magnetoresistive manganite, ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$ (LSMO). Surprisingly, we observed a significant increase in the current spin polarization with the…
Combining scanning electron microscopy (SEM) and electron-beam-induced current (EBIC) imaging with transport measurements, it is shown that the current flowing across a two-terminal oxide-based capacitor-like structure is preferentially confined in areas localized at defects. As the thin-film device switches between t…
We present the computer simulation results of a chain of hard point particles with alternating masses interacting on its extremes with two thermal baths at different temperatures. We found that the system obeys Fourier's law at the thermodynamic limit. This result is against the actual belief that one dimensional syst…
We analyze a two-dimensional phase field model designed to describe the dynamics of crystalline grains. The phenomenological free energy is a functional of two order parameters. The first one reflects the orientational order, while the second reflects the predominantally local orientation of the crystal. We consider t…
We study electromagnetic waves scattering by a 2D photonic crystal made of a stack of diffraction gratings. In case where there are only two propagative modes in the crystal, we derive an explicit expression for the superior (resp. inferior) envelope of the reflected (resp. transmitted) energy.
Double perovskites ${\mathrm{Sr}}_{2}\mathrm{Fe}M{\mathrm{O}}_{6}$ $(M=\mathrm{Mo}$ and Re) exhibit significant colossal magnetoresistance even at room temperature due to the high Curie temperatures (419 and 401 K). However, such a high Curie temperature is puzzling, given the large separation between magnetic element…