Materials Literature
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We report results of high-speed polarization relaxation measurements in ferroelectric thin film capacitors. Polarization relaxation has been reported to occur in two distinct time regimes, one for relaxation times in the range of a few milliseconds and a second for longer relaxation times. We find that the polarizatio…
The multiple scattering interferences due to the addition of several contiguous potential units are used to construct composite complex potentials that absorb at an arbitrary set of incident momenta or for a broad momentum interval.
We apply Pauli's master equation to spin tunneling in ${\mathrm{Mn}}_{12}$ acetate, and argue that the corresponding relaxation is exponential in time. Taking advantage of this simplification we calculate the frequency dependent specific heat. The results are compared with recently obtained experimental ones. We also…
Recent experiments by Lee et al. [Nature (London) 363, 255 (1997)] show that doping carbon single-wall nanotube (SWNT) ropes with K, Rb, or ${\mathrm{Br}}_{2}$ leads to metallic conductivity, but the structure and properties are not known. We used molecular dynamics to predict structures and properties which should he…
The powder IR phonon spectra of synthetic garnets of the six binaries in the system Mg3Al2Si30i2 (Pyrope - Py) - Fe3Al2Si30i2 (Almandine - Al) - Mn3Al2Si3Oi2 (Spessartine - Sp) - Ca3AbSi30i2 (Grossular - Gr) have been recorded and analyzed. Between 14 and 17 Fiu-symmetry infrared active modes were observed for the dif…
We have used a metal–oxide bilayer Raman scattering technique to study lattice dynamics in SrTiO3 thin films. The SrTiO3 thin films were epitaxially grown on a conducting metal–oxide layer which reflects the exciting laser beam so that it does not enter the LaAlO3 substrate. Raman scattering from the SrTiO3 thin films…
Thirty one layer TiO2/SiO2 optical filters with graded refractive index profiles were fabricated by helicon plasma sputtering at room temperature. Multilayer films were deposited on glass (BK7) and Si (100) substrates simultaneously and sequentially. The measured transmittance spectrum exhibited a reflectance of 99.8%…
We report the molecular beam epitaxy (MBE) growth of the manganese(II) phthalocyanine thin films with unique crystal structure and the measurement of their magnetic properties. The epitaxial films were grown on hydrogen-terminated Si(111) substrates. Reflection high energy electron diffraction observations showed that…
Electrothermal poling of soft glasses (soda lime and borosilicate glass) at relatively high currents led to the creation of a second-order optical nonlinearity. The second-harmonic generation efficiency decays in time, and the decay rate can be accelerated by exposure to intense infrared radiation.
Characteristic features in photocurrent (PC) and electron paramagnetic resonance (EPR) spectra are discussed and attributed to main defects in the gap of optical-quality chemical vapor deposited diamond. A shoulder in the PC spectra with an onset at about 2.2 eV is attributed to the single-substitutional nitrogen defe…
Author: Gratz, R. et al.; Genre: Journal Article; Finally published : 1998; Title: Monazite xenotime thermometry. III. Experimental calibration of the partitioning of Gadolinium between monazite and xenotime
The elastic strain field of a dislocation is highly affected by nearby dislocations. The effects of dislocation-dislocation interactions on elastic energy and core structure are analyzed using a new and self-consistent method to apply periodic boundary conditions on unit cells containing dislocations. Local density fu…
A system is glassy when the observation time is much smaller than the equilibration time. A unifying thermodynamic picture of the glassy state is presented. Slow configurational modes are in quasiequilibrium at an effective temperature. It enters thermodynamic relations with the configurational entropy as a conjugate…
We present results on the normal-collective current conversion processes and associated deformation profile for a charge density wave in the sliding state. High resolution x-ray measurements of the satellite positional shift have been performed on ${\mathrm{NbSe}}_{3}$ at 90 K. The shift $q$ has been determined in the…
A study of the liquid crystalline phase transitions in a system of hard-sphere chains is presented. The chains comprise m=7 tangentially bonded hard-sphere segments in a linear conformation (LHSC). The isothermal–isobaric Monte Carlo simulation technique is used to obtain the equation of state of the system both by co…
In the static field limit, the vibrational hyperpolarizability consists of two contributions due to: (1) the shift in the equilibrium geometry (known as nuclear relaxation), and (2) the change in the shape of the potential energy surface (known as curvature). Simple finite field methods have previously been developed…
Drastic enhancements of the interdiffusion were observed in Cu-Ni diffusion couples when samples were heated under high hydrogen pressures $(\ensuremath{\sim}5\mathrm{GPa})$. Interdiffusion coefficients measured between $600--800\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ were increased by $\ensuremath{\sim}{10}^{4…
We report on a study of phonons in diamond using a new instrument for high resolution inelastic x-ray scattering at the Advanced Photon Source. We have paid particular attention to possible overbending of the most energetic branches, i.e., LO along both $\ensuremath{\Gamma}\ensuremath{-}X$ ( $\ensuremath{\equiv}\ensur…
Asymmetric polarization switching of Pb(Zr,Ti)O3 (PZT) thin films with different electrode configuration has been studied in (La,Sr)CoO3/Pb(Zr,Ti)O3/(La,Sr)CoO3 (LSCO) heterostructures in which the conducting oxide (La,Sr)CoO3 and/or LaCoO3 (LCO) have been used as an electrode. Polarization-voltage (P-V) hysteresis lo…
Compact expressions, complete through second order in electrical and/or mechanical anharmonicity, are given for the dynamic dipole vibrational polarizability and dynamic first and second vibrational hyperpolarizabilities. Certain contributions not previously formulated are now included.