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  • 1
    Electronic Resource
    Electronic Resource
    Measurements on standing waves in GaAs coplanar waveguide at frequencies up to 20.1 GHz by electro-optic probing (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 419-421 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the experimental results of the standing waves in GaAs coplanar waveguides at frequencies up to 20.10 GHz with different terminations (open, short, and 50 Ω) by a new electro-optic probing technique. The effective refractive indices from 4.11 to 20.10 GHz are presented and compared with theoretical values. Dispersion of coplanar waveguide in that frequency range is shown to be negligible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341444
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  • 2
    Electronic Resource
    Electronic Resource
    Cluster motion on metals: Ir on Ir(111) (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 6535-6536 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Diffusivities have for the first time been quantitatively measured for two-dimensional clusters of iridium atoms on a metal surface, Ir(111). As cluster size increases from two to seven atoms, the diffusivity generally diminishes, but tetramers are an exception. It is shown that their high mobility comes about because of weak interatomic binding, and a low activation energy for diffusion, rather than from a change in the mechanism of motion, which involves displacements of individual adatoms independent of cluster size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457658
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  • 3
    Electronic Resource
    Electronic Resource
    Variational calculations for metastable systems: Thermodynamic properties of glass transitions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1871-1876 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: It is demonstrated, both theoretically and numerically, that the Gibbs–Bogoliubov (GB) thermodynamic variational calculation, developed originally for equilibrium systems, can be applied to a thermodynamic metastable system provided the structure of the reference system, used in this calculation, has the same main features as the metastable system under consideration. Following this, the GB thermodynamic variational calculation, employing the hard-sphere system as the reference system, is used to quantitatively determine the thermodynamic features of the metallic glass transition. Good agreement with observation is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456029
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  • 4
    Electronic Resource
    Electronic Resource
    A computer and analytic study of the metallic liquid–glass transition (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 2700-2705 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The present work examines two aspects of metallic liquid–glass transitions. First, a computer experiment, consisting of a temperature-quench Monte Carlo calculation for the liquid–glass transition of Ca0.7Mg0.3, is carried out. A comparison with such calculations for monatomic metals indicates that there is a significant difference in the Wendt and Abraham criterion for monatomic metals and metallic alloys. In addition, a comparison with laboratory experiments indicates that the discrepancies between the Wendt–Abraham parameters obtained in these laboratory experiments and in the computer experiments can be ascribed to different cooling rates. Second, an analytic study of the pair distribution function near the transition temperature is presented and reproduces the linear temperature dependence of the Wendt–Abraham parameter. This gives a physical picture for this parameter and indicates that the liquid–glass transition is more likely to be a first-order transition than a second-order one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453999
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  • 5
    Electronic Resource
    Electronic Resource
    Atomic jump lengths in surface diffusion: Re, Mo, Ir, and Rh on W(211) (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 5087-5096 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Measurements with the field ion microscope have been made of the distribution function governing the displacements of a single metal atom diffusing on W(211). It is shown that by comparing such measurements with the predictions of random walk models, the contributions of jumps of different lengths to the overall diffusion can be ascertained, even if diffusion is dominated by transitions between adjacent sites. Extensive observations for rhenium, as well as for molybdenum atoms on W(211) are best represented by a symmetric random walk between nearest-neighbor sites, without any contribution from longer jumps. For iridium and rhodium atoms, however, double jumps do appear to participate in the diffusion, but amount to only ≈3% of the total.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457600
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  • 6
    Electronic Resource
    Electronic Resource
    A computer and analytic study of the metallic liquid–glass transition. II. Structure and mean square displacements (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4309-4312 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A study, using both computational and analytic techniques, of the extent to which the cage concept of liquids applies to the metallic liquid–glass transition is presented. Monte Carlo calculations on a Ca0.7Mg0.3 system yield the angular distribution functions required to determine the cage structure and the atomic motion. The analysis parallels that for normal liquids. The results indicate that the cages are icosahedral, that they exist from the melting temperature down into the glass state, and that the cage concept applies quantitatively to the static properties of metallic binary alloys. Finally, the cage concept itself does not appear to describe fully atomic diffusion in metallic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454813
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  • 7
    Electronic Resource
    Electronic Resource
    Linearized velocity disturbances and dynamic Oseen tensors in simple shear and elongational flows (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 570-574 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigate the velocity disturbance produced by point-like sources of force in viscous fluids subjected to unbounded, simple shear, and elongational flows of arbitrary strength. The response to the body force is given by the dynamic Oseen tensor which is constructed using the propagator for the linearized Navier–Stokes equation. Application of the method of characteristics leads to "Kelvin mode''-type solutions for the velocity disturbances and explicit analytical expressions are obtained for the propagators and Oseen tensors in the above mentioned flows.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456508
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  • 8
    Electronic Resource
    Electronic Resource
    Epitaxial growth of superconducting YBa2Cu3O7−x thin films by reactive magnetron sputtering (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 902-904 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Perfect epitaxial growth of superconducting YBa2Cu3O7−x thin films have been achieved on (100) SrTiO3, (110) SrTiO3, and (100) ZrO2 substrates using a modified planar dc magnetron sputtering system. The films exhibit zero resistances at 87–90 K with transition widths of about 2 K. The critical current density of 1.4×106 A/cm2 at 77 K so far has been measured on the (100) SrTiO3 substrate. The epitaxial orientation of the thin films was influenced by the substrate orientation, the substrate temperature, and the oxygen partial pressure. The quality of growth and the epitaxial orientation of the films were examined by electron channeling, x-ray diffraction, and reflection high-energy electron diffraction techniques. The preferential epitaxial orientation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102450
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  • 9
    Electronic Resource
    Electronic Resource
    Surface-emitting second-harmonic generator for waveguide study (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 422-424 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel surface emission of coherently generated second-harmonic wave is reported for the first time.The technique is used for the observation of the difference in propagation constant of the TE0 and TM0 mode of GaAs/AlGaAs waveguide cavity to a high degree of accuracy. In this technique the second-harmonic signal propagates out from the top surface of the waveguide structure, converting the modal phase difference between TE0 and TM0 modes into intensity variation along the waveguide length. The second-harmonic signal is easily observable by the naked eye, and the technique does not require wavelength tuning or mechanical movement for the measurement of birefringence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99430
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  • 10
    Electronic Resource
    Electronic Resource
    Relationship between hole trapping and interface state generation in metal-oxide-silicon structures (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1431-1433 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have discovered a general relationship between the location of trapped holes and the subsequent generation of interface states. Experimentally, we find that a hole can become an interface state, but it must first be trapped between 20 and 70 A(ring) from the Si/SiO2 interface (near-interfacial hole trap) and then transfer to within 18 A(ring) of the interface (interfacial trapped holes). Finally, the hole captures an electron and becomes an interface state. The transfer process between near-interfacial and interfacial trapped holes does not seem to be a simple release-capture process. Rather it appears to involve a complicated migration of the trapped hole defect towards the interface. Radiation-hardened oxides are shown to have a similar number of near-interfacial traps, but these traps are shallower than those in the soft oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99690
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