Materials Literature
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In this article we shortly review previous and recently published experimental results that provide evidence for intrinsic, magnetic-impurity-free ferromagnetism and for high-temperature superconductivity in carbon-based materials. The available data suggest that the origin of those phenomena is related to structural…
The effects of neutron irradiation on normal state and superconducting properties of epitaxial magnesium diboride thin films are studied up to fluences of 1020 cm-2. All the properties of the films change systematically upon irradiation. Critical temperature is suppressed and, at the highest fluence, no superconductin…
Ferromagnetism is observed below 10 K in [Bi0.75Te0.125Mn0.125]Te. This material has the BiTe structure, which is made from the stacking of two Te-Bi-Te-Bi-Te blocks and one Bi-Bi block per unit cell. Crystal structure analysis shows that Mn is localized in the Bi2 blocks, and is accompanied by an equal amount of TeBi…
We theoretically study the nonlocal spin transport in a device consisting of a nonmagnetic metal (N) and ferromagnetic injector (F1) and detector (F2) electrodes connected to N. We solve the spin-dependent transport equations in a device with arbitrary interface resistance from a metallic-contact to tunneling regime,…
Power moments, modified moments, and optimized moments are powerful tools for solving microscopic models of macroscopic systems; however the expansion of the density of states as a continued fraction does not converge to the macroscopic limit point-wise in energy with increasing numbers of moments. In this work the mo…
We have performed a series of neutron diffuse scattering measurements on a single crystal of the solid solution $\mathrm{Pb}({\mathrm{Zn}}_{1∕3}{\mathrm{Nb}}_{2∕3}){\mathrm{O}}_{3}$ doped with 8% $\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_{3}$, a relaxor compound with a Curie temperature ${T}_{C}\ensuremath{\sim}450\phantom{…
Epitaxial thin films of relaxor ${\mathrm{PbMg}}_{1∕3}{\mathrm{Nb}}_{2∕3}{\mathrm{O}}_{3}$ and ${\mathrm{PbSc}}_{0.5}{\mathrm{Nb}}_{0.5}{\mathrm{O}}_{3}$, and ferroelectric ${\mathrm{PbZr}}_{0.65}{\mathrm{Ti}}_{0.35}{\mathrm{O}}_{3}$, ${\mathrm{Pb}}_{0.955}{\mathrm{La}}_{0.045}{\mathrm{Zr}}_{0.65}{\mathrm{Ti}}_{0.35}{…
Combining time-dependent density functional calculations for electrons with molecular dynamics simulations for ions, we investigate the dynamics of excited carriers in a (3,3) carbon nanotube at different temperatures. Following an hnu=6.8 eV photoexcitation, the carrier decay is initially dominated by efficient coupl…
A new geometry for polyoxoniobates is observed in {Nb24O72H9}15−, the largest isopolyoxoniobate cluster anion known to date. Its structural evolution from isolated Lindqvist anions [Nb6O19]8− and the cyclic pyrochlore unit [Nb6O30] through to the complex dimer [({Nb24O72H9} {Cu(en)2(H2O)}2{Cu(en)2})2]18− is discussed.
Nondestructive readout by an excitation light with high fluorescence contrast has been achieved using red, green, and blue fluorescent dyes (see figure). Reversible thermoresponsive recording of fluorescent images (TRF) using a molecularly doped matrix made up of a fluorescent dye, a leuco dye, and a developer is repo…
Using density functional theory within the local spin density approximation, the structural, electronic, and magnetic properties of $\mathrm{Sr}\mathrm{Ru}{\mathrm{O}}_{3}$ are investigated. We examine the magnitude of the orthorhombic distortion in the ground state and also the effects of applying epitaxial constrain…
Electrochemical oxidation of the antiferromagnetically ordered SrCoO(2.5), with brownmillerite-type structure, to the cubic ferromagnet SrCoO(3), with perovskite structure, has been investigated in situ by neutron diffraction as well as by X-ray absorption fine structure (XAFS) spectroscopy in specially designed elect…
ACT domains are found in a wide variety of proteins and in a variety of different arrangements. The majority of these bind amino acids that function to regulate some aspect of amino acid metabolism. Most ACT domain-containing proteins have been discovered in Bacteria and Archaea, indicating that the domain appeared ve…
We report on the thermoelectric properties of the Heusler-type ${\mathrm{Fe}}_{2}{\mathrm{VAl}}_{1\ensuremath{-}x}{\mathrm{Ge}}_{x}$ alloys with compositions $0\ensuremath{\le}x\ensuremath{\le}0.20$. While ${\mathrm{Fe}}_{2}\mathrm{VAl}\phantom{\rule{0.3em}{0ex}}(x=0)$ exhibits a semiconductorlike behavior in electric…
Abstract Iron archaeological artefacts were studied to understand long‐term corrosion by the atmosphere. Indeed, these samples collected on the construction elements of ancient monuments present ancient rust layers formed during their exposure over centuries to the indoor atmosphere. Thanks to Raman spectroscopy and t…
This first book to take a detailed look at one of the key focal points where nanotechnology and polymers meet provides both an introductory view for beginners as well as in-depth knowledge for specialists in the various research areas involved. It investigates all types of application for block copolymers: as tools fo…
Silicone nanofilaments (see figure) are grown by a simple chemical vapor deposition method on different substrate materials. The filaments are flexible, and have lengths of up to several micrometers and diameters of up to 150 nm. The dense and entangled arrangement of these filaments yields a superhydrophobic coating…
We examine some of the optical properties of a metamaterial consisting of thin layers of alternating metal and dielectric. We can model this material as a homogeneous effective medium with anisotropic dielectric permittivity. When the components of this permittivity have different signs, the behavior of the system bec…
A UV-light-emitting homojunction ZnO LED is grown by radiofrequency sputtering at high temperature, improving the structural, electrical, and optical properties of the n- and p-type ZnO layers. The figure shows a comparison of the electroluminescence spectra of A) a p–n homojunction ZnO LED and B) a ZnO LED with Mg0.1…
ZnO nanorod arrays were fabricated using a hydrothermal method. The nanorods were studied by scanning electron microscopy, photoluminescence (PL), time-resolved PL, X-ray photoelectron spectroscopy, and positron annihilation spectroscopy before and after annealing in different environments and at different temperature…