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  • 1
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    Optical properties of epitaxial CoSi2 and NiSi2 films on silicon (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The optical constants of epitaxial films of CoSi2 and NiSi2, grown by molecular beam epitaxy on Si(111), in the energy range of 0.9-4.0 eV have been measured. The behavior of the optical constants is characteristic of metals. It is Drude-like in low energy region and deviates from Drude behavior as interband transitions set in. Interband transitions are found to have already set in at 1 eV. The absorption varies significantly with energy, which has implications for photoresponse studies of internal photoemission in these material systems.
    Keywords: SOLID-STATE PHYSICS
    Type: Journal of Applied Physics (ISSN 0021-8979); 66; 2738-274
    Format: text
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  • 2
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    High temperature superconductors (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The two principle objectives are to develop materials that superconduct at higher temperatures and to better understand the mechanisms behind high temperature superconductivity. Experiments on the thermal reaction, structure, and physical properties of materials that exhibit superconductivity at high temperatures are discussed.
    Keywords: SOLID-STATE PHYSICS
    Type: Consortium for Materials Development in Space. Technical Section; p 78-82
    Format: application/pdf
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  • 3
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    Processing and properties of high Tc oxide/silver matrix composite superconductors (1989)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: This paper describes the processing conditions for the formation of strong flux pinning high-Tc (REE)1Ba2Cu3O7/AgO (RE-123/AgO) composites with the RE-123:AgO ratio of 3:1 and presents the magnetization and critical field data on these composites. The results obtained indicate that proper processing conditions are critical to the formation of strong flux pinning RE-123/AgO composites. Resistance measurements in a magnetic field show that the upper critical field in Y-123/AgO is about three times larger than that of the Y-123 compound.
    Keywords: SOLID-STATE PHYSICS
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  • 4
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    Processing of strong flux trapping high T(subc) oxide superconductors: Center director's discretionary fund (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Magnetic suspension effect was first observed in samples of YBa2Cu3O7/AgO(Y-123/AgO) composites. Magnetization measurements of these samples show a much larger hysteresis which corresponds to a large critical current density. In addition to the Y-123AgO composites, recently similar suspension effects in other RE-123/AgO, where RE stands for rare-Earth elements, were also observed. Some samples exhibit even stronger flux pinning than that of the Y-123/AgO sample. An interesting observation was that in order to form the composite which exhibits strong flux trapping effect the sintering temperature depends on the particular RE-123 compound used. The paper presents the detailed processing conditions for the formation of these RE-123/AgO composites, as well as the magnetization and critical field data.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-TM-100350 , NAS 1.15:100350
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  • 5
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    High-temperature processing of oxide superconductors and superconducting oxide-silver oxide composite (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: High temperature processing was found to partially convert the green 211 phase oxide to 123 phase. High Tc superconductivity was observed in Bi-Sr-Cu-O and Y-Sr-Cu-O systems prepared using the same heat treatment process. High temperature processing presents an alternative synthetic route in the search for new high Tc superconductors. An unusual magnetic suspension with enhancement in critical current density was observed in the 123 and AgO composite.
    Keywords: SOLID-STATE PHYSICS
    Type: Chemistry of High-Temperature Superconductors II; Sept. 25-30, 1988; Los Angeles, CA; United States
    Format: text
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  • 6
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    Studies of molecular-beam epitaxy growth of GaAs on porous Si substrates (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: GaAs has been grown on porous Si directly and on Si buffer layer-porous Si substrates by molecular-beam epitaxy. In the case of GaAs growth on porous Si, transmission electron microscopy (TEM) reveals that the dominant defects in GaAs layers grown on porous Si are microtwins and stacking faults, which originate from the GaAs/porous Si interface. GaAs is found to penetrate into the porous Si layers. By using a thin Si buffer layer (50 nm), GaAs penetration diminishes and the density of microtwins and stacking faults is largely reduced and localized at the GaAs/Si buffer interface. However, there is a high density of threading dislocations remaining. Both Si (100) aligned and four degree tilted substrates have been examined in this study. TEM results show no observable effect of the tilted substrates on the quality of the GaAs epitaxial layer.
    Keywords: SOLID-STATE PHYSICS
    Type: Journal of Vacuum Science and Technology B (ISSN 0734-211X); 6; 696-698
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  • 7
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    Observation of enhanced properties in samples of silver oxide doped YBa2Cu3O(x) (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Samples of YBa2Cu3O(x) doped with silver oxide (Tc is about 93 K) have exhibited attractive forces in gradient magnetic fields, both normal and tangential to the surfaces, which are more than twice the sample weight. This allows sample suspension below a rare earth magnet. Critical current density was increased by about 100 at 77 K. Persistent fields, flux pinning, magnetization, and modeling are described.
    Keywords: SOLID-STATE PHYSICS
    Type: Applied Physics Letters (ISSN 0003-6951); 52; 2066
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  • 8
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    High-temperature processing of cuprate oxide superconductors (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Superconducting Y1Ba2Cu3O7 ('123') films were fabricated on the Y2BaCuO5 ('211') phase substrate. The superconducting characteristics of these films, in terms of superconducting transition temperature (Tc) and width, are better than those using other oxide compounds as substrates. In addition, using high-temperature processing, the bulk 211 phase was converted into the 123 phase. A new high Tc copper oxide material with non-rare-earth elements (Bi-Sr-Cu-O) was prepared using similar high-temperature processing. High-temperature processing presents an alternative synthetic route in the search of new high Tc superconductors.
    Keywords: SOLID-STATE PHYSICS
    Type: Applied Physics Letters (ISSN 0003-6951); 52; 1915-191
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  • 9
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    Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A stable and reproducible superconductivity transition between 80 and 93 K has been achieved and maintained in a Y-Ba-Cu-O compound system at ambient pressure in a simple liquid-nitrogen Dewar. An upper critical field Hc2(0) estimate of between 80 and 180 T is obtained, and the paramagnetic limiting field at 0 K for a sample with a T(c) of about 90 K is 165 T. It is suggested that the lattice parameters, the valence ratio, and the sample treatments all play a role in achieving superconductivity above 77 K.
    Keywords: SOLID-STATE PHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 58; 908-910
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  • 10
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    Study of some superconducting and magnetic materials on high T sub c oxide superconductors (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: On the basis of existing data it appears that the high-temperature superconductivity above 77 K reported here, occurs only in compound systems consisting of a phase other than the K2NiF4 phase. A narrow superconducting transition was obtained with T sub c0 = 98 K and T sub c1 = 94 K in Y-Ba-Cu-O (YBCO). Preliminary results indicate that YBCO is rather different from the layered LaBCO, LaSCO, and LaCCO. While electron-photon interaction cannot be absent from this compound system, nonconventional enhanced superconducting interactions due to interfaces, Resonating Valence Bond (RVB) states, or even a superconducting state beyond the BCS framework, may be required to account for the high T sub c in YBCO. It is believed that study of the possible subtle correlation between magnetism and superconductivity will definitely provide important insight into the superconducting mechanism in YBCO and other oxides.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-CR-182330 , NAS 1.26:182330
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