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  • American Institute of Physics (AIP)  (11)
  • 2020-2020
  • 1995-1999  (11)
  • 1975-1979
  • 1970-1974
  • 1997  (11)
  • 1
    Digitale Medien
    Digitale Medien
    Silicidation process of Ti/TiNx/Si structures (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 781-785 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: One of the most promising metallization schemes on silicon is the TiN/TiSi2/Si structure, since it takes advantage from both the good electrical contact between Si and TiSi2 and the property as a diffusion barrier of TiN. A related system that shows some interesting features is the Ti/TiNx/Si system. The results of two Ti/TiNx/Si structures with different nitride compositions (TiN0.7 and TiN0.8) have been studied. These structures show good electrical characteristics after thermal treatments (〉900 °C) and allow one to obtain a smooth variation of the Schottky barrier height, which could lead to tunable contacts in the 0.57–0.53 eV range. Rutherford backscattering spectrometry and grazing incidence x-ray diffraction have been used to establish that the phase sequence observed during the silicidation process is very dependent on the diffusion rate of silicon through the TiNx layer. Finally, the slowest silicidation rate in the Ti/TiNx/Si system permits a higher incorporation of nitrogen from the atmosphere during the thermal treatment, as determined by nuclear reaction analysis. All these characteristics show that these structures can lead to the preparation of the TiN/TiSi2 C54/TiNx/Si in a single thermal treatment. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.364140
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  • 2
    Digitale Medien
    Digitale Medien
    Passivation, structural modification, and etching of amorphous silicon in hydrogen plasmas (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 7612-7618 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Atomic hydrogen from plasma discharges dissolves in silicon previously amorphized by ion implantation (aSi) in the form of Si–H bonds, giving rise to infrared (IR) absorption at ∼1990 cm−1 and causing partial activation of implanted dopants. Passivation of aSi does not affect the rate at which the material subsequently undergoes solid phase epitaxy. Exposure giving rise to [H]〉6 at. % causes the appearance of an additional IR absorption band at ∼2080 cm−1 and coloration of the layer. Despite annealing, the Si–H defects, normal solid phase epitaxy does not occur during subsequent heat treatment. The structural modification by H-plasma exposure coincides with etching of the layer. The observations can be understood in terms of void formation in aSi resulting from the clustering of Si–H. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.365337
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  • 3
    Digitale Medien
    Digitale Medien
    Competing magnetic interactions in manganese perovskites : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5481-5483 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Structural and magnetotransport properties of L2/3A1/3MnO3 (A=Ca, Sr) oxides reveal the gradual increase of the magnetic frustration when bending the Mn–O–Mn bonds. The relative strength of competing magnetic interactions and thus the ferromagnetic ordering temperature TC are controlled not only by R0 (R0 is the mean radius of the lanthanides) but also by the electronegativity of the divalent cation. Consequently, the curve TC(R0) is not universal but it is sensitive to the alkaline ions. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.364633
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  • 4
    Digitale Medien
    Digitale Medien
    Acoustic detection of laser induced melting of metals (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 1014-1016 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Real time detection of pulsed laser surface melting was performed by analyzing the photoacoustic signals produced on the samples. Comparison between the amplitudes of the transversal and longitudinal waves allowed us to identify the fluence thresholds for surface melting. The method was tested with AISI 304 stainless steel samples and the results obtained were checked against direct metallographic analysis. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.364196
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  • 5
    Digitale Medien
    Digitale Medien
    High accuracy Raman measurements using the Stokes and anti-Stokes lines (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 3976-3982 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We show that by measuring the separation between the Stokes and anti-Stokes peaks excited by two different laser lines we obtain a very precise determination of absolute phonon energies. The method is useful for measuring small changes of these energies with strain, temperature, laser power, etc. It doubles the changes and avoids the necessity of using the reference lines in the Raman spectra. The method can be applied for the determination of phonon deformation potentials, for the characterization of strained heteroepitaxial layers, and for micro-Raman analysis of strain in silicon integrated circuits. We give examples of phonon shifts in Si, Ge, GaAs, InAs, and GaP as a function of applied biaxial strain, laser power, and temperature. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.366537
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  • 6
    Digitale Medien
    Digitale Medien
    Spectroscopic response of photoinduced currents in a laser-assisted scanning tunneling microscope (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 4153-4158 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Thermal expansion of the sample or tip in a laser-assisted scanning tunneling microscope (STM) junction can obstruct the study of other phenomena related with STM–light interactions, when photoinduced currents are analyzed. In this article, we show that the thermal contribution is proportional to the average tunneling current and that this can be used to distinguish it from other contributions. Simultaneous tunneling current–voltage and photoinduced current–voltage curves are recorded for highly oriented pyrolitic graphite and gold samples with a Pt tip. We have done the measurements for two different polarizations of the incident beam. We show that the I–V curves can be used to discriminate between different mechanisms that appear, producing photoinduced currents. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.366216
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  • 7
    Digitale Medien
    Digitale Medien
    Interface pinning in high Tc-high Jc Nd1+xBa2−xCu3Oy directionally solidified in air (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 413-415 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Single domain bars of NdBa2Cu3O7/Nd4Ba2Cu2O10 (Nd123/422) superconducting composites have been fabricated in air by using a directional solidification technique. Tc values of 96.5 K can be obtained after an Ar heat treatment and further oxygenation thus showing that reduced oxygen partial pressure during solidification is not a fundamental requirement to prepare high-Tc Nd123 bulk superconductors. The temperature dependence of the critical currents point to a limited efficiency of the Nd123/422 interfaces to pin vortices. High resolution electron microscopy observations clearly reveal smooth Nd123/422 interfaces thus suggesting that interface pinning may not be as relevant as compared to Y123/211 composites. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.119326
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  • 8
    Digitale Medien
    Digitale Medien
    Exact quantum stereodynamics: The steric effect for the Li+HF→LiF+H reaction (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 3339-3340 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: To study the stereodynamics of atom diatom reactions, we apply the formalism developed by Aquilanti et al. [J. Phys. Chem. 95, 8184 (1991)]. As a case study the prototype Li+HF→LiF+H reaction at zero total angular momentum J is considered. For this reaction we calculated the scattering SJ-matrix in the standard |lj〉 representation and transformed it into a stereodirected representation. In this way it is possible to investigate the effect on the reaction probability of the orientation of the target HF molecule with respect to Li attack. In the investigated collision energy range (0.45–0.54 eV) propensity is found for Li attack on the side of H atom. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.474684
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  • 9
    Digitale Medien
    Digitale Medien
    Fundamental measure theory for mixtures of parallel hard cubes. I. General formalism (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 6379-6389 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: This article, the first of a series of two, describes the formulation of Rosenfeld's fundamental measure theory for a mixture of parallel hard cubes, a model recently introduced to study the demixing transition for additive hard core potentials. Special emphasis is put on the good performance of the functional when reducing the dimensionality of the system, a necessary feature to give reasonable results in highly inhomogeneous situations. This property allows for an extremely simple formulation of the theory in arbitrary dimensions. In a subsequent article we will describe the properties of the mixture as they are predicted by the theory, in particular the demixing in presence of the freezing transition. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.474298
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  • 10
    Digitale Medien
    Digitale Medien
    Further studies of the methyl nitrite cis→trans isomerization (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 5393-5405 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Classical trajectory calculations have been performed to get more insights into the dynamics of cis→trans isomerization of methyl nitrite. Harmonic (diagonal and nondiagonal) and anharmonic potential energy surfaces with parameter values based on the available experimental data and our own ab initio results have been used in these computations. The ab initio calculations have been carried out at the MP2 and QCISD levels of theory, employing the 6-311++G** basis set. Coupling of vibrational modes is analyzed in detail. The influence of molecular rotation and isotopic substitution on the isomerization rate is investigated. Mode specific effects are clearly exhibited for the diagonal-harmonic potential, but they are significantly reduced by inclusion of anharmonicity or interaction terms in the potential function. It is found that modes that exhibit specificity are coupled with the reaction coordinate and with other vibrational modes that couple with the reaction coordinate as well. A comparison of rate coefficients computed for several deuterated species show an unexpected secondary isotope effect. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.474261
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