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  • Springer Nature  (171)
  • American Physical Society  (98)
  • American Institute of Physics (AIP)  (48)
  • 1990-1994  (317)
  • 1
    Electronic Resource
    Electronic Resource
    Conversion loss of a YBa2Cu3O7 grain boundary mixer at 20 GHz (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 333-335 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the conversion gain of a YBa2Cu3O7 annealed grain boundary microbridge mixer by operating the device as a lower side-band down-converter from an 18.5 GHz radio frequency to a 1.5 GHz intermediate frequency under the action of a 20.0 GHz local oscillator. We have found the conversion gain to be relatively independent of bias up to a current density which marks the onset of the flux flow resistance. Above the onset of flux flow resistance, the gain decreased dramatically. A maximum conversion gain of −8±4 dB was measured at 25 K. The mixer was operated with a local oscillator power of only −60 dBm. The results demonstrate that high Tc superconductor mixers are capable of delivering comparable conversion gains to Schottky diode mixers while requiring substantially lower power local oscillators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107928
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  • 2
    Electronic Resource
    Electronic Resource
    Measurements of noise and temperature coefficient of resistance on YBa2Cu3O7−δ thin films in magnetic field (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 246-248 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We measured low-frequency noise and temperature coefficient of resistance β=(dR/dT)/R on YBa2Cu3O7−δ thin films at varying temperatures around superconducting transition. Magnetic field densities of 18–88 G were applied to the films. We found Tc to decrease slightly with magnetic field even though β at the respective Tc remained constant. At the superconducting transition, the voltage noise power spectral density over the 10–1000 Hz frequency range decreased with magnetic field, whereas no change in noise behavior was observed with varying the magnetic field in normal state. At a constant temperature in transition, as the magnetic field density was varied, the noise magnitude followed the β2 dependence as predicted by the local thermal fluctuations theory of 1/f noise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106978
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  • 3
    Electronic Resource
    Electronic Resource
    Dielectric waveguide with a YBa2Cu3O6+x boundary layer at 94 GHz (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 3194-3196 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the measurement of the millimeter wave transmission properties of a dielectric waveguide with a YBa2Cu3O6+x boundary layer. The transmitted power and phase shift of a 94 GHz signal propagating through the dielectric waveguide structure was measured over the temperature range of 77–150 K. The transmitted power was observed to depend upon temperature due to the dissipation of the millimeter wave signal in the YBa2Cu3O6+x boundary layer. Thereby the temperature dependence of the normal-state ac conductivity was measured. The experimental data were fitted to a Drude model for the normal-state ac conductivity of the YBa2Cu3O6+x. The temperature dependence of the Drude scattering time was obtained. The scattering time was found to decrease with decreasing temperature and was 7.5–11.2 ps in magnitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345404
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular diffusion in plasma-polymerized tetrafluoroethylene (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4041-4046 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diffusion of an array of molecules in micrometer-thick films of plasma-polymerized tetrafluoroethylene has been measured using an optical interferometric technique. The diffusivity is approximately independent of molecular size up to a molar volume of about 100 cm3 and drops rapidly for larger molecules. For much larger molecules no penetration of the films is observed. These results suggest that plasma-polymerized tetrafluoroethylene films are heavily cross linked and that this limits the size of the molecules that can penetrate the polymer. The temperature dependence and the molecular size dependence of the diffusivities are discussed in the context of free-volume theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352259
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  • 5
    Electronic Resource
    Electronic Resource
    Optical and electrical characterization of magnesium-doped bismuth substituted lutetium iron garnet thin films (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 924-928 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Near-infrared optical absorption and Faraday rotation have been studied, in addition to the room-temperature sheet resistance, in a series of magnesium-doped bismuth substituted lutetium iron garnet (Bi:LuIG) thin films grown by liquid phase epitaxy. Faraday rotation was measured at 1150 and 1300 nm as a function of the MgO concentration in the melt. Optical absorption data indicate valence exchange as a possible mechanism for increased optical absorption at compositions different from charge compensation. Faraday rotation data display a magnesium doping dependent behavior, as do the I-V characteristics. Additionally, the I-V data of unetched and etched films near compensation suggest a two-layer structure to the films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351314
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  • 6
    Electronic Resource
    Electronic Resource
    Properties of micrometer-thick plasma-polymerized tetrafluoroethylene films (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 2326-2332 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Several physical properties of thin plasma-polymerized films have been measured using a new fiber-optic-based technique. Films of plasma-polymerized tetrafluoroethylene (PPTFE) deposited on the end of an optical fiber form an optical cavity, the reflectivity of which is very sensitive to the film thickness. The fiber is used as an in situ monitor of the deposition rate in the plasma and, after removal from the plasma, the mechanical properties of the film can be measured. With this measurement technique the thermal expansion of the film normal to its surface as well as the swelling of the film when exposed to an array of organic solvents have been determined. A significantly smaller thermal-expansion coefficient and larger degree of swelling are observed relative to bulk PTFE. X-ray photoelectron spectroscopy measurements show that the fluorocarbon chains are highly branched and have a fluorine-to-carbon ratio of 1.45. These results suggest that the plasma-polymerized films are not crystalline and are heavily cross linked.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349428
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  • 7
    Electronic Resource
    Electronic Resource
    Coherent continuous wave operation of 10×10×2 grating-surface-emitting diode laser array in a ring configuration (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7645-7647 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coherent cw operation of a 10×10×2 grating-surface-emitting diode laser array in a ring configuration is demonstrated. At near twice the threshold current, the ring array exhibits a high degree of spatial coherence (an average of 86%) between emitting grating sections and a narrow linewidth of 28 MHz. The far field fringe visibility is 80% and 88% in the lateral and longitudinal directions, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350363
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  • 8
    Electronic Resource
    Electronic Resource
    Detection of ground-state atomic hydrogen in a dc plasma using third-harmonic generation (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3814-3817 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Third-harmonic generation (THG) was used to monitor ground-state atomic hydrogen H(1s 2S1/2) in a dc plasma system. A 364.6 nm laser beam focused through H2 or CH4/H2 plasmas induced THG at 121.5 nm, near the atomic hydrogen 2p 2PoJ→1s 2S1/2 Lyman-α transition. Both the intensity and frequency shift of the excitation spectra exhibited dependence on the plasma power. Absolute H atom concentration was estimated by comparing the frequency shift to that obtained in a calibrated microwave discharge flow system. The sensitivity was ∼4×1013 cm−3 (100 ppm). The measured atomic hydrogen densities were substantially less than in other diamond chemical vapor deposition methods and may explain the lower diamond deposition rates obtained with dc plasma systems of this type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346263
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  • 9
    Electronic Resource
    Electronic Resource
    Inelastic electron tunneling spectroscopy and atomic force microscopy investigation of ultrathin sputtered amorphous silica films on gold (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2347-2352 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultrathin amorphous SiO2 films are radio frequency sputter deposited onto thin film gold electrodes and incorporated as the insulating barrier in metal/insulator/metal tunnel junctions of the type Au/SiO2/Pb. Inelastic electron tunneling spectra (IETS) recorded at 4.2 K reveal characteristic zero bias anomalies associated with rapid variations in the Pb density of states on either side of the superconducting gap which shows unequivocally that tunneling is the primary conduction mechanism through the junctions at this temperature. Full IET spectra reported are essentially identical to those previously recorded for similar SiO2 films on aluminum. Atomic force and scanning tunneling microscope images of the SiO2 and underlying gold films are also presented; these data confirm that the SiO2 films are sufficiently uniform and continuous for IETS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353112
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  • 10
    Electronic Resource
    Electronic Resource
    Microwave and magneto-optic properties of bismuth-substituted yttrium iron garnet thin films (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4938-4940 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Microwave and magneto-optic measurements have been made on bismuth-substituted yttrium iron garnet (BiYIG) films. Forward-volume (FV) magnetostatic-wave (MSW) attenuation has been measured from ferrimagnetic resonance and from pulse delay data. We report the indirect observation of FV MSW in BiYIG using two independent techniques: a pulse transmission technique and a passband measurement technique. Faraday rotation in the films was also recorded at a wavelength of 1.3 μm. The bismuth-substituted films are grown on carefully cleaned substrates and have yttrium:bismuth ratios of 1:1. The composition of the bismuth substituted films is Y1.5Bi1.5Fe5O12 deduced from lattice parameters and absolute Faraday rotation. These films show particular promise for use in waveguide-type high-speed MSW-optical devices where low MSW attenuation and high Faraday rotation are among the necessary criteria for successful operation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344738
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