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  • American Institute of Physics (AIP)  (26)
  • Mineralogical Society of Great Britain and Ireland
  • 1
    Electronic Resource
    Electronic Resource
    Comparison of Bi-system 2223 and 2212 thick superconducting tapes: Grain alignment, current density, and strain effects (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 1596-1599 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Bi-Sr-Ca-Cu-O (2212) and Bi-Pb-Sr-Ca-Cu-O (2223) superconductors were fabricated into silver-sheathed tapes by cold rolling and sintering. The resulting samples are compared in terms of microstructural alignment, critical current density, and strain dependence. Although both samples show good grain alignment, that of the 2212 phase is superior due to partial melting during heat treatment. This microstructural superiority is reflected in superior Jc as well. The single-filament and multifilament 2212 tapes have Jc (approximately-greater-than) 5 × 104 A/cm2 and Jc (approximately-greater-than) 1.5 × 104 A/cm2 at 20 T, respectively. Each material shows a similar dependence of Jc upon strain, with the 2223 phase exhibiting slightly more degradation. Furthermore, multifilamentary tapes were less affected by strain than single-filament tapes. A multifilamentary tape at 4.2 K, 0.5 T showed only a weak dependence upon strain, indicating that the strain dependence of the Bi system at low temperature may not be severe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349523
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  • 2
    Electronic Resource
    Electronic Resource
    Nonlinear effect on surface charging by diatomic ion bombardment (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 878-879 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Surface charging by ion bombardment is investigated using a quasistable charging condition in which one can evaluate the degree of charging by an intensity of secondary ions. It is found that a nonlinear effect on the charging occurred under monoatomic and diatomic ion bombardments. Namely, O+2 -ion irradiation enhances the charging in comparison with O+-ion irradiation, although atomic dose and energy/atom are kept the same in both ion bombarbments. Since the results also show that the surface charging is suppressed when the energy of incident ions is higher, the nonlinear effect by diatomic ion irradiation is attributed not to an increase of energy density, but to a dense cascade in the overlapping region of cascades caused by two constituents of the incoming diatom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346776
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  • 3
    Electronic Resource
    Electronic Resource
    V3Si multifilamentary superconductor produced by a modified bronze process (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6454-6456 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A V3Si multifilamentary superconductor with high overall Jc has successfully been fabricated by a modified bronze process. A double-stacked Cu-8.5 at. %Si/Ta/(Cu-8.5 at. %Si/V) composite with fine V filaments (∼1 μm) was prepared, where the primary bundle is sheathed with a Ta diffusion barrier; thus only Si in the bronze inside of the Ta barrier is available for the subsequent diffusion reaction. The combination of adjusting the total proportion of V to Si in the composite to ∼3 and reducing V filaments to ∼1 μm allows the completion of reaction in short times to decompose the initially formed V5Si3 and produce mostly V3Si without grain growth. The overall Jc(4.2 K) values so far obtained are 1.3×109 A/m2 at 5 T and 1×108 A/m2 at 12.5 T, which are 10 times larger than conventional V3Si wires. These values are comparable to those of Nb3Sn multifilamentary wires produced by the bronze process for ac use.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355132
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  • 4
    Electronic Resource
    Electronic Resource
    Contour effect in metal-in-gap heads (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4869-4871 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pseudogap in a metal-in-gap head causes ripples in output spectra. This gap is a layer with poor magnetic properties at the boundary between sendust film and a ferrite core. The ripple amplitude reduces as the bonding temperature decreases. It also depends on the ferrite-core crystal orientation. We examined the diffusion at the boundary by Auger-electron spectroscopy and investigated the crystal structure of sendust films by x-ray diffraction. It is proved that diffusion causes the contour effect. The thickness of the diffusion layer at the boundary depends on bonding temperature. It is also found that the diffusion at the boundary and the crystal structures of the sendust film are independent of the crystal orientation of the ferrite cores. Computer-simulation results indicate that the contour effect is a function of the ferrite-core permeability. The permeability varies in accordance with the crystal orientation. The above explains that the contour effect depends on the ferrite-core crystal orientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344762
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  • 5
    Electronic Resource
    Electronic Resource
    Low-energy excitations in amorphous polymers (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 5332-5340 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In order to investigate low-energy excitations below 10 meV, inelastic neutron-scattering measurements have been carried out on various organic amorphous polymers at 10 and 50 K and three inorganic glasses at 150 and 295 K. It was found that a broad excitation peak is observed for all amorphous materials in the ω range of 1.5–4.0 meV irrespective of different chemical structures. On the other hand, highly crystalline polyethylene with a degree of crystallinity 0.96 shows no such broad peak, indicating that the low-energy excitation is characteristic of amorphous materials. We have employed an asymmetric double-well potential as a common origin for the low-energy excitation in amorphous materials and analyzed the results of amorphous polyisobutylene to confirm validity of this model and alternatively to determine parameters of the potential. Analysis of the temperature dependence of the inelastic-scattering intensity of the low-energy excitation leads to a concept of phonon-assisted tunneling in the asymmetric double-well potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461647
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  • 6
    Electronic Resource
    Electronic Resource
    Metalorganic molecular beam epitaxy growth characteristics of GaAs using triethylgallium and trisdimethylaminoarsenic (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 1952-1958 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Metalorganic molecular beam epitaxy (MOMBE) growth characteristics of GaAs using triethylgallium (TEGa) and trisdimethylaminoarsenic (TDMAAs) are studied in detail by using reflection high energy electron diffraction intensity oscillations. It is found that the GaAs growth rate variation with substrate temperature (Tsub) is similar to that in the MOMBE growth of GaAs with TEGa and elemental As (As4) except in the high Tsub region, despite the use of uncracked TDMAAs instead of As4. GaAs growth starts at about 350 °C and shows a maximum growth rate at about 500 °C. However, the absolute growth rate is about 15% lower than that using As4 with the same TEGa flow rate in the mass-transport limited growth region. Above 600 °C the growth rate shows a rapid decrease with increasing Tsub. Further, it is found that etching of GaAs occurs when only TDMAAs is supplied to the GaAs surface at Tsub above 500 °C. Unintentionally doped GaAs films show n-type conduction in the whole Tsub range investigated with the highest 77 K electron mobility of 22 000 cm2/V s and a low carrier concentration of 2×1015 cm−3 for the 650 °C grown samples. 4.2 K photoluminescence spectra show an exciton-bound-to-impurity emission peak at the wavelength of 819.3 nm with a full width at half-maximum of less than 3.5 meV indicating good optical qualities. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358829
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  • 7
    Electronic Resource
    Electronic Resource
    Optically pumped ZnSe-based vertical cavity surface emitter with SiO2/TiO2 multilayer reflector (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4784-4786 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated a SiO2/TiO2 high-reflectivity dielectric multilayer mirror specifically suitable for ZnSe-based vertical cavity surface-emitting lasers operating in the green-to-blue spectral region. In the fabrication process, the thickness of each layer has been precisely controlled by using an in situ optical monitoring system. A photo-pumped ZnCdSe/ZnSe/ZnSSe surface-emitting laser has also been demonstrated using the SiO2/TiO2 dielectric multilayer mirrors stacked with the ZnCdSe/ZnSe/ZnSSe structures. Cavity mode emission with a linear polarization has been observed in the direction normal to the surface at 20 K. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359758
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetization and critical current density of the Bi-(Pb)-Sr-Ca-Cu-O tapes in magnetic fields (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2772-2774 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Bi-(Pb)-Sr-Ca-Cu-O superconductor was fabricated into tapes with a Cu sheath. Measurements of magnetization and critical current density Jc in magnetic fields up to 23 T were made for them. The magnetization measurement revealed that, at 4.2 K, these tape specimens had excellent Jc -H(magnetic field) characteristics, while at 77 K, the flux pinning force in them was reduced to zero above 0.3 T due to the flux creep. In the resistive Jc measurement at 4.2 K, these tape specimens showed Jc of ∼7000 A/cm2 at 23. The Jc -H curve showed a slight peak effect, indicating the peak over 30 T.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101950
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  • 9
    Electronic Resource
    Electronic Resource
    Pinning mechanism in a continuous ultrafine Nb3Al multifilamentary superconductor (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2444-2446 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: For Nb3Al multifilamentary superconductors fabricated by a newly developed composite process using continuous ultrafine Al-based alloy cores and pure Nb matrix, Jc properties have been investigated in detail in regard to the size and morphology of the Al core. A significant enhancement in pinning force caused by reducing the Al core size and an anisotropy in Jc observed in a rolled tape have indicated that the Nb3Al-matrix (or core) interface acts as a dominant pinning center of fluxoids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100523
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  • 10
    Electronic Resource
    Electronic Resource
    Superconducting properties of Nb3Al multifilamentary wire (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1724-1725 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nb3Al multifilamentary wire has been fabricated by a newly developed process, in which a composite consisting of a niobium matrix and a large number of Al-Mg alloy cores is cold drawn into a wire with ultrafine Al-Mg alloy filaments (about 0.1 μm), and then heat treated to form Nb3Al filaments by the diffusion reaction between the Al-Mg alloy cores and the Nb matrix. The wire shows excellent high-field superconducting properties comparable to those of the practical Nb3Sn multifilamentary wire.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99712
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