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  • 1
    Electronic Resource
    Electronic Resource
    Nonlinear conductivity of an In-Y1Ba2Cu3O7−x interface (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3968-3971 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report dynamic resistance (dV/dI) measurements of a large, macroscopic interface between In metal and polycrystalline Y1Ba2Cu3O7−x. The interface was prepared by pressing a 3-mm2 In pellet onto a freshly prepared Y1Ba2Cu3O7−x polycrystalline ceramic surface. Although this interface covered about 105 crystallites of the superconductor, the electrical characteristics were very similar to those observed in point contact measurements on both single-crystal and polycrystalline specimens. A slowly varying bias-dependent background resistivity, narrow resistance peaks, and a zero-bias resistance anomaly were all features of the dV/dI spectra. Both the temperature and magnetic field dependencies of the interface conductivity are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343364
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  • 2
    Electronic Resource
    Electronic Resource
    Superlattice excitons and optical absorption (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 7369-7378 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A formalism based on the superlattice crystal coordinate representation, which is valid for arbitrary well and barrier widths, is developed and applied to the Wannier exciton problem. A simple model for the electron-hole Coulomb interaction within the independent subband approximation permits nonvariational calculation of exciton binding energies, oscillator strengths, and optical absorption of both bound and continuum exciton states. The effects of growth axis directed electric and magnetic fields are emphasized. Numerical results for GaAs/ Ga1−xAlxAs and In1−xGaxAs/GaAs exciton binding energies and oscillator strengths as functions of well width, barrier width, and electric and magnetic field strengths show excellent agreement with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355005
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  • 3
    Electronic Resource
    Electronic Resource
    Higher order nonlinear response in dilute random composites (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 4072-4073 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effective response of a random nonlinear composite consisting of a nonlinear material with a displacement-electric field relation of the form D=εB0E+χB||E||βE randomly embedded in a host with a linear D-E relation is studied. Using the Maxwell–Garnett approximation and taking into account the correction to the local field in the presence of nonlinear inclusions, expressions are derived for the effective response to the order of χB and χB2, which are valid in the dilute limit of the nonlinear component in the composite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354071
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  • 4
    Electronic Resource
    Electronic Resource
    Effective nonlinear response in dilute nonlinear granular materials (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3009-3010 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We consider the nonlinear response of a granular material in which a concentration p of spherical grains of nonlinear material are embedded in a linear host. An approximation, based on the Maxwell–Garnett formula, is proposed for the effective nonlinear susceptibility which is applicable for arbitrary nonlinearity in the dilute limit of embedded grains. The nonlinear susceptibility is found to be χeff=p[3ε0A/(ε0B +2ε0A)]2||3ε0A/(ε0B +2ε0A)||βχB, where ε0A is the dielectric constant of the linear host, and the displacement and electric field in the nonlinear grains are related by D=ε0BE+χB||E||βE. Previous results on cubic nonlinearity are recovered as a special case of the present approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346439
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  • 5
    Electronic Resource
    Electronic Resource
    Theory of third harmonic generation in random composites of nonlinear dielectrics (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 3451-3458 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We consider the effective nonlinear susceptibility tensor χ for third harmonic generation (THG) in a nonlinear composite medium in which the components may have nonvanishing second- and third-order nonlinear susceptibilities. We derive an expression for this susceptibility in terms of the positional-dependent second- and third-order susceptibilities within the composite, as well as several factors which describe the local field effect in a corresponding linear medium. We consider both the THG due to the presence of THG susceptibility in the components, and the induced THG due to the presence of second-order nonlinear susceptibilities in the components. The resulting expression can be used to calculate both local field and percolation effects on χ in a wide range of geometries. The general expression reduces to a simple result in the dilute limit, which is similar to that previously derived. An effective medium approximation, which is applicable to the whole range of concentration, is proposed for both the effective second and third harmonic susceptibilities. Results obtained from the general expression and the effective medium approximation are found to be in good agreement with those obtained by numerical simulations for a model system of nonlinear composites consisting of a nonlinear metallic component and a linear insulating component. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368519
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  • 6
    Electronic Resource
    Electronic Resource
    Biased switching in an interacting pair of magnetic particles (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 5957-5961 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The switching dynamics in a pair of coupled magnetic particles is studied numerically via the Landau-Liftshitz-Gilbert form of a set of damped gyromagnetic equations. The effects of dipolar interaction between the particles, anisotropy energy, switching and a small bias field are included. Initial conditions in which the moments are parallel and antiparallel to each other are considered. The presence of a small transverse bias field and inter-particle coupling assists in the switching of a moment. Due to the complicated interplay among different factors, the switching in one particle may lead to a corresponding precession of moment in a neighboring particle. We show that different final configurations may be attained depending on the inter-particle separation and the initial configuration. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1465511
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  • 7
    Electronic Resource
    Electronic Resource
    Theory of Faraday rotation in granular magnetic materials (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 2736-2741 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a formalism to treat Faraday rotation (FR) in composite media. The method is not limited to low concentrations of magnetically active inhomogeneities and is thus useful for understanding the magneto-optical properties of such inhomogeneous media over the whole range of concentrations. It involves the calculation of an effective magnetic-field-dependent dielectric tensor @sεe using a tensor effective-medium approximation. To illustrate the technique, we present the results of several model calculations involving both paramagnetic and ferromagnetic metals. We find that such materials have strongly enhanced FR over a wide range of frequencies. The effects of particle shapes on FR are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345438
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  • 8
    Electronic Resource
    Electronic Resource
    Theory of second harmonic generation in composites of nonlinear dielectrics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 4740-4743 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We consider the effective nonlinear susceptibility tensor d(−2ω;ω,ω) for second harmonic generation in a nonlinear composite medium. We derive a simple expression for this susceptibility in terms of the position-dependent tensor d, and three factors that describe the local field enhancement in a corresponding linear medium. The resulting expression can be used to calculate the local-field enhancement of d in many geometries. In the dilute limit, the general expression reduces to a result previously derived. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366398
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  • 9
    Electronic Resource
    Electronic Resource
    Theory of effective response in dilute strongly nonlinear random composites (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1810-1812 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effective response of random media consisting of two different kinds of materials, each of which with current density and electric field relation of the form J=χ|E|2E, is studied in the dilute concentration limit of one of the components. Based on linearizing the problem in standard mean field treatments and determining the mean fields self-consistently, a simple expression for the effective response is derived which is valid to the first order of the concentration of the dilute component. The result is then generalized to systems of arbitrary spatial dimensions and arbitrary nonlinearity. Our result represents a generalization of the low concentration expression widely used in linear random composites resulted from the Maxwell–Garnett approximation and the effective medium approximation to strongly nonlinear random composites of arbitrary dimensions and nonlinearity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117494
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal conductivity of graded composites: Numerical simulations and an effective medium approximation (1999)
    Springer
    Journal of materials science 34 (1999), S. 5497-5503 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We describe two methods for modeling the thermal conductivity and temperature profile in a graded composite film. The film consists of a random binary composite, whose concentration varies in the direction perpendicular to the film surface, and a fixed temperature difference is applied across the film. In the first method, the temperature profile is modeled directly, using a finite element technique in which the film is represented as a discrete network of thermal conductances, randomly distributed according to the assumed composition profile. The temperature at each node, and the effective thermal conductance, is then obtained by a transfer matrix technique. In the second approach, the film is treated by an effective-medium approximation, suitably generalized to account for the composition gradient. The methods are in rough agreement with each other, and suggest that thermophysical properties of the film can be treated reasonably well by approaches generalized from those which succeed in conventional composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004760427981
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