Naoki Hayashi、Tatsuhisa Kato、Takayuki Aoki 等 6 位作者2001-06-15Physical Review Letters
To clarify the thresholdless, hysteresis free V-shaped switching due to frustration between ferro- and antiferroelectricity, we have studied a prototype binary mixture system. The apparent orientational order parameters, $〈{P}_{2}〉$ and $〈{P}_{4}〉$, obtained from polarized Raman scattering in thin homogeneous cells in…
Nonlinear Dynamics and Pattern FormationLiquid Crystal Research AdvancementsTheoretical and Computational Physics
Aparajeo Chattopadhyay、Andrew J. Millis、S. Das Sarma2001-06-15Physical review. B, Condensed matter
We present the $T=0$ phase diagram of the double-exchange model (ferromagnetic Kondo lattice model) for all values of the carrier concentration n and Hund's couplng J, within dynamical mean field theory. We find that depending on the values of n and J, the ground state is either a ferromagnet, a commensurate antiferro…
Theoretical and Computational PhysicsMagnetic and transport properties of perovskites and related materialsPhysics of Superconductivity and Magnetism
Christian Brosseau、P. Molinié、F. Boulic 等 4 位作者2001-06-15Journal of Applied Physics
Electron paramagnetic resonance (EPR) has now become firmly established as one of the methods of choice for analyzing the carbon network over a range of different volume fraction of the carbon black in the composite, i.e., below and above the respective conduction threshold concentration. In the present article, two t…
Electron Spin Resonance StudiesCarbon Nanotubes in CompositesConducting polymers and applications
Giovanna Piantanida、A. Breskin、R. Chechik 等 7 位作者2001-06-15Journal of Applied Physics
The effect of moderate heating (200–300 °C) in vacuum on the photoemission from air-exposed hydrogen-terminated chemical vapor deposited diamond films was studied in the photon spectral range of 140–210 nm (8.9–5.9 eV). A three- to fivefold enhancement was observed, stable in high vacuum and in some high purity gases,…
Photocathodes and Microchannel PlatesElectron and X-Ray Spectroscopy TechniquesDiamond and Carbon-based Materials Research
F. Bechstedt、A. A. Stekolnikov、J. Furthmüller 等 4 位作者2001-06-15Physical Review Letters
Ab initio calculations of the $2\ifmmode\times\else\texttimes\fi{}1$, $c(2\ifmmode\times\else\texttimes\fi{}8)$, and $7\ifmmode\times\else\texttimes\fi{}7$ reconstructions of the diamond, Si, and Ge(111) surfaces are reported. The $\ensuremath{\pi}$-bonded chain, adatom, and dimer-adatom-stacking fault models are stud…
Electronic and Structural Properties of OxidesDiamond and Carbon-based Materials ResearchBoron and Carbon Nanomaterials Research
Bosang S. Kim、Mohammad A. Islam、Louis E. Brus 等 4 位作者2001-06-15Journal of Applied Physics
Three-dimensional arrays of organically passivated CdSe nanocrystals were investigated under hydrostatic pressure using photoluminescence (PL) and absorption spectroscopies. Interdot separations were varied coarsely by varying the organic ligand on the nanocrystal and finely by applying hydrostatic pressure. The PL an…
Perovskite Materials and ApplicationsChalcogenide Semiconductor Thin FilmsQuantum Dots Synthesis And Properties
Andréi L. Kholkin、E. K. Akdoğan、A. Safari 等 5 位作者2001-06-15Journal of Applied Physics
Electromechanical properties of a number of ferroelectric films including PbZrxTi1−xO3(PZT), 0.9PbMg1/3Nb2/3O3–0.1PbTiO3(PMN-PT), and SrBi2Ta2O9(SBT) are investigated using laser interferometry combined with conventional dielectric measurements. Effective electrostriction coefficients of the films, Qeff, are determine…
Photorefractive and Nonlinear OpticsAcoustic Wave Resonator TechnologiesFerroelectric and Piezoelectric Materials
Richard D. Averitt、A. I. Lobad、C. Kwon 等 6 位作者2001-06-15Physical Review Letters
Ultrafast picosecond measurements of optically induced changes in the absolute conductivity (0.4--1.0 THz) of ${\mathrm{La}}_{0.7}{M}_{0.3}{\mathrm{MnO}}_{3}$ thin films ( $M\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}\mathrm{Ca}$, Sr) from 10 K to $\ensuremath{\sim}{0.9T}_{c}$ reveal a two-component relaxation…
Electronic and Structural Properties of OxidesMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter Physics
R W Eaton2001-06-15Journal of Bacteriology
Several 2-substituted benzoates (including 2-trifluoromethyl-, 2-chloro-, 2-bromo-, 2-iodo-, 2-nitro-, 2-methoxy-, and 2-acetyl-benzoates) were converted by phthalate-grown Arthrobacter keyseri (formerly Micrococcus sp.) 12B to the corresponding 2-substituted 3,4-dihydroxybenzoates (protocatechuates). Because these pr…
biodegradable polymer synthesis and propertiesEffects and risks of endocrine disrupting chemicalsChemistry and Chemical Engineering
Yukitoshi Motome、Nobuo Furukawa2001-06-15Journal of the Physical Society of Japan
Critical phenomena of ferromagnetic transition at finite temperatures are studied in double-exchange systems. In order to investigate strong interplay between charge and spin degrees of freedom, Monte Carlo technique is applied to include fluctuations in a controlled and unbiased manner. By using finite-size scaling a…
Advanced Condensed Matter PhysicsMagnetic and transport properties of perovskites and related materialsTheoretical and Computational Physics
Xuehao He、Mo Song、Haojun Liang 等 4 位作者2001-06-15The Journal of Chemical Physics
Self-assembly of symmetric diblock copolymers in confined state has been investigated by means of Monte Carlo simulation method. The symmetric diblock copolymers were confined in two- (parallel walls or circle) or in three-dimensional (spherical or cylindrical) space. There are interactions between these boundaries an…
Advanced Polymer Synthesis and CharacterizationMachine Learning in Materials ScienceBlock Copolymer Self-Assembly
R. T. F. van Schaijk、A. de Visser、E. Mcrae 等 6 位作者2001-06-15arXiv
The 2D Fermi surface of 1st stage PdAl2Cl8 acceptor-type graphite intercalation compounds (GICs) has been investigated using the Shubnikov-de Haas (SdH) effect. One fundamental frequency is observed, the angular variation of which confirms its strongly 2D nature, as previously found through electrical conductivity mea…
Materials Science
Bas B. Van Aken、Auke Meetsma、Thomas T. M. Palstra2001-06-15arXiv
We refined the crystal structure of AMnO3, with A = Y, Er, Yb and Lu by single crystal x-ray diffraction. Our results show some distinct differences with previous reports on LuMnO3 and YbMnO3. We show that the ferroelectric behaviour is originated in the dipole moment at the A-site, and not, as is the common opinion,…
Materials ScienceStrongly Correlated Electrons
Michael L. Falk、Alan Needleman、James R. Rice2001-06-15arXiv
Finite element calculations of dynamic fracture based on embedding cohesive surfaces in a continuum indicate that the predictions are sensitive to the cohesive law used. Simulations were performed on a square block in plane strain with an initial edge crack loaded at a constant rate of strain. Cohesive laws that have…
Materials Science
P. B. Robinson、J. R. Blake、Tetsuya Kodama 等 5 位作者2001-06-15Journal of Applied Physics
The motion of single- and two-cavitation bubbles generated by laser beams directly beneath a free surface is studied experimentally, using high-speed photography, and theoretically using the highly accurate boundary integral method. Favorable comparisons of bubble shape history and centroid motion are observed while t…
Nuclear Physics and ApplicationsUltrasound and Cavitation Phenomena
P. S. Dobal、Anju Dixit、Ram S. Katiyar 等 6 位作者2001-06-15OpenAlex
In this study, the phase transition behavior of the BaTiO3–BaZrO3 system was studied using micro-Raman scattering and dielectric measurement techniques. BaZrxTi1−xO3 ceramics were prepared for x=0.00, 0.05, 0.08, 0.15, 0.20, and 1.00 compositions using a solid-state reaction technique. A single-phase perovskite struct…
Microwave Dielectric Ceramics SynthesisDielectric properties of ceramicsFerroelectric and Piezoelectric Materials
George R. Newkome、Charles N. Moorefield、Fritz Vögtle2001-06-15OpenAlex
Masses, sizes, shapes of macromolecules from multifunctional monomers from theory to practice - historical perspectives, self-similarity, and preparative considerations dendrimers derived by divergent procedures using 1-2 branching motifs dendrimers derived by divergent procedures using 1-3 branching motifs convergent…
Dendrimers and Hyperbranched PolymersComputational Drug Discovery Methods
Brent J. Maranzano、Norman J. Wagner2001-06-15OpenAlex
The particle size dependence of the reversible shear thickening transition in dense colloidal suspensions is explored. Five suspensions of monodisperse silica are synthesized via the Stöber synthesis. The physicochemical properties of the dispersions are quantified using transmission electron microscopy, dynamic light…
Electrostatics and Colloid InteractionsMaterial Dynamics and PropertiesRheology and Fluid Dynamics Studies
R. Nagarajan、A. D. Draeseke、A.W. Sleight 等 4 位作者2001-06-15OpenAlex
CuCr 1−x Mg x O 2 , a wide band gap semiconductor with the delafossite structure, has been synthesized in bulk and thin-film form. Bulk undoped CuCrO2 is almost black and has moderate conductivity with p-type carriers. Upon doping with 5% Mg, the conductivity increases by a factor of 1000. In films, the best p-type co…
Copper-based nanomaterials and applicationsNanomaterials and Printing TechnologiesAdvanced Photocatalysis Techniques
Jiangtao Hu、Liang‐shi Li、Weidong Yang 等 6 位作者2001-06-15OpenAlex
Colloidal quantum rods of cadmium selenide (CdSe) exhibit linearly polarized emission. Empirical pseudopotential calculations predict that slightly elongated CdSe nanocrystals have polarized emission along the long axis, unlike spherical dots, which emit plane-polarized light. Single-molecule luminescence spectroscopy…
Chalcogenide Semiconductor Thin FilmsNanocluster Synthesis and ApplicationsQuantum Dots Synthesis And Properties