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  • 1
    Electronic Resource
    Electronic Resource
    Improved microwave performance of Ag-doped Y1Ba2Cu3O7−δ thin film microstrip resonators (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5105-5108 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Microwave transmission properties of undoped and Ag-doped laser ablated thin film Y1Ba2Cu3O7−δ microstrip resonators have been studied both on 〈100(approximately-greater-than) MgO and 〈100(approximately-greater-than) LaAlO3 substrates at X-band frequencies. While the Q factor and microwave surface resistance, Rs, of undoped films showed better performance on LaAlO3 as compared to that on MgO, Ag-doped films on LaAlO3 showed far greater improvement as reflected not only by a decrease in Rs but also by a total absence of its microwave power dependence up to 13 dBm at 77 K. These results are explained as due to the influence of Ag in increasing the grain size and grain alignment and thus, significantly decreasing the density of grain boundary weak links which are known to affect the microwave transmission in high temperature superconductor films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353783
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  • 2
    Electronic Resource
    Electronic Resource
    Analytic approach to glow discharge theory: The physical model (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 5820-5825 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: On the basis of fluid approximation, a physical model in analytic form for dc glow discharge is presented. The model has yielded a variety of analytic expressions for the physical quantities concerned. These analytic expressions are functional, self-consistent, and satisfy all the governing equations as well as the real boundary conditions. With the builtin feature of mode indexing, the model may be employed for a wide range of applications. Several physically significant points which have not been reported previously were revealed from the present model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350476
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  • 3
    Electronic Resource
    Electronic Resource
    Analytic approach to glow discharge theory: Result and analysis (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 5826-5833 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the analytic expressions given in the preceding article, S. T. Pai [J. Appl. Phys. 71, 5820 (1992)] the concerned physical quantities n, N, V, Ez, Γ−, Γ+, and Jz and many others for dc glow discharges were calculated and systematically analyzed under various conditions. Several physically significant points have been brought forward via the analysis. Comparisons between the present results and the corresponding ones obtained by previous investigators showed similarities between them in many aspects. Such similarities signify the wide range applicability of the present model. The builtin feature of mode indexing in the model has been quantitatively demonstrated. Results yielded from such a demonstration are consistent with the corresponding physical situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350477
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  • 4
    Electronic Resource
    Electronic Resource
    Erratum: "Closed form analytic solutions describing glow discharge plasma'' [Phys. Plasmas 3, 3842 (1996)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1176-1176 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872617
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  • 5
    Electronic Resource
    Electronic Resource
    Erratum: "Experimental study of spatial distribution of Ar glow discharge plasma" [Phys. Plasmas 3, 3853 (1996)] (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1176-1176 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872618
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  • 6
    Electronic Resource
    Electronic Resource
    Experimental study of spatial distribution of Ar glow discharge plasma (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3853-3857 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The characteristics of the spatial distribution of Ar glow discharge plasma were experimentally investigated. By means of direct comparisons between theory and experiment, the effects of the variation of gap separation, gas pressure, and electrode radius on the spatial distributions of electron density and electric field were studied. Results indicate that the maximum electron density moves toward the cathode as the gap separation or gas pressure increases while variation of electrode radius produces little effect. Predictions from a theoretical model have been experimentally verified. General agreements between theory and experiment were found to be reasonably good except in the cathode region, where discrepancy exists. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871941
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  • 7
    Electronic Resource
    Electronic Resource
    Closed form analytic solutions describing glow discharge plasma (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 3842-3852 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: On the basis of an analytic model developed previously [S. T. Pai, J. Appl. Phys. 71, 5820 (1992)], an improved version of the model for the description of dc glow discharge plasma was successfully developed. A set of closed form solutions was obtained from the governing equations. The two-dimensional, analytic solutions are functional and completely satisfy the governing equations, the actual boundary conditions, and Maxwell equations. They can be readily used to carry out numerical calculations without the necessity of employing any assumed boundary conditions. Results obtained from the model reveal that as the discharge gap spacing or pressure increases the maximum value in the electron density distribution moves toward the cathode. At a sufficiently large value of gap spacing, the positive column phenomenon begins to appear in the discharge region. The model has the capability of treating the positive column and negative glow as a continuous system without the necessity of studying them separately. The model also predicts a sharp rise of the positive ion density near the cathode and field reversal in the anode region. Variation of the electrode radius produces little effect on the axial spatial distribution of physical quantities studied. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871516
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  • 8
    Electronic Resource
    Electronic Resource
    Silver doping and its influence on the oxygenation during in situ growth of YBa2Cu3O7−x thin films (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1349-1351 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of Ag doping on both oxygenation and deoxygenation during growth of YBa2Cu3O7−x films at 700 °C by pulsed laser deposition has been studied. Experiments show that undoped and Ag-doped films grown at 200 mTorr oxygen pressure and quenched immediately after termination of growth have a superconducting transition temperature Tc of 61 and 86 K, respectively. The high Tc of 86 K obtained with quenched Ag-doped films is thought to be due to both enhanced oxygen incorporation and reduced deoxygenation associated with Ag doping. These results show that Ag-doped YBa2Cu3O7−x films could be crucial for realizing devices based on multilayer structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357802
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  • 9
    Electronic Resource
    Electronic Resource
    Pulsed laser ablation: A new route to synthesize novel superconducting compounds as oriented films (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1082-1091 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report here the significance of the pulsed laser ablation technique in stabilizing strained lattices that do not form by the conventional ceramic method and show that the technique offers unique possibilities to probe the structure property relationship in complicated systems. One of such systems is LuBa2Cu3O7−δ; a systematic investigation of structural (in)stability of its superconducting phase is presented here. Our analysis suggests that the system suffers from internal strain due to lower ionic radius of Lu3+; however, the structure can be stabilized only as oriented films on 〈100〉 LaAlO3, 〈100〉 SrTiO3, and 〈100〉 MgO, with excellent superconducting properties (Jc≈5.0×106 A cm−2 at 77 K). We have also investigated similar compounds having their stability close to their crystallographic limit. The important feature of these metastable phases is that they grow only as oriented films. Free energy of epitaxial growth of strained films are investigated and a simple growth model is proposed based on our observation. Importance of this growth model in explaining the superconductor–normal-metal–superconductor type of junctions, observed in high-Tc superconductors is highlighted. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360898
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  • 10
    Electronic Resource
    Electronic Resource
    Surface resistance, residual losses, and granularity in Ag-doped YBa2Cu3O7−δ thin films (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 4258-4260 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied microwave surface resistance Rs and residual resistance Rres in undoped and Ag-doped laser ablated thin-film YBa2Cu3O7−δ microstrip resonators on LaAlO3 substrates. While the undoped films showed a frequency dependence Rs∝fp, where p=1.9±1, Ag-doped films showed p=1.6±1 and 1.4±1 for 5 and 10 wt % Ag doping, respectively. Lower p values and higher Rres observed in Ag-doped films indicate a metallic contribution. However, the advantage of Ag-doped films has been shown to be at 77 K at which they not only have a lower Rs but also a low dRs/dT, thus making them superior to undoped films for microwave devices operating at 77 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355965
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