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  • 1
    Electronic Resource
    Electronic Resource
    Materials Processing in the Reduced-Gravity Environment of Space (1983)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Materials Research 13 (1983), S. 247-278 
    Details
    ISSN: 0084-6600
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ms.13.080183.001335
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic ordering and electric polarizability of Zn-doped La2CuO4+δ single crystals : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6595-6597 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization, magnetic susceptibility, and low-frequency dielectric constant of La2Cu1−xZnxO4+δ (x=0, and 0.07) single crystals were measured. Results obtained in this work show that Zn doping eliminates spins from CuO planes, thus, reducing the correlation length, ξ2D. However, unlike Sr doping, magnetic dilution due to Zn doping is a very local effect, thus suppresses TN relatively slowly and shows little impact on metamagnetic behavior. Our data marks a difference from some results previously reported which claimed a stronger effect on Zn doping on the magnetic properties. It is interesting that Zn doping shows a large influence on the dielectric properties, and resulting in a significant change in the dielectric constant Kc. Most remarkably, the simultaneous polarization and magnetization ordering, described in this study, suggests a coupling of magnetic ordering and electric polarizability in the oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356906
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of the structural and magnetic ordering of Fe3O4/NiO superlattices grown by oxygen-plasma-assisted molecular-beam epitaxy : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6218-6220 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Oriented single-crystalline thin films of NiO and Fe3O4 and Fe3O4/NiO superlattices have been grown on cleaved and polished substrates of MgO(001) using oxygen-plasma-assisted molecular-beam epitaxy (MBE). We report the growth mode and structural characterization of these films using in situ RHEED and ex situ scanning electron microscopy and x-ray diffraction, and their magnetic characterization using SQUID magnetometry. Also reported are preliminary results of magnetotransport measurements. MgO has a very small lattice mismatch to the cubic rocksalt structure of NiO and to the half-unit-cell dimension of the spinel structure of Fe3O4. Pseudomorphic growth of superlattices consisting of alternating layers of NiO and Fe3O4 with repeat wavelength down to 17 A(ring) and of single thick layers of either of these materials are readily obtained. The grown films exhibit cubic single-crystalline symmetry in registry with the substrate, with sharp interfaces and strongly layer-thickness-dependent strain. RHEED pattern evolution in situ during growth indicates development of the rocksalt-like NiO and spinel Fe3O4 crystalline symmetries as each of the alternating layers of the superlattices are deposited. Magnetic hysteresis curves for superlattices with repeat wavelength less than 75 A(ring) exhibit a crossover from the conventional ferrimagnetic response expected of Fe3O4 found in longer wavelength superlattices and bulklike thick films to a more linear magnetic response that correlates strongly to the layer thickness dependence of lattice distortions and strain. Large magnetoresistance (6% at 55 kOe) is also observed for these short-wavelength superlattices, with the observed change in resistance nearly linear with field and with small hysteresis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350000
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  • 4
    Electronic Resource
    Electronic Resource
    Observation of a propagating normal/superconducting interface via I-V analysis in YBa2Cu3Ox (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 745-747 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Current-voltage (I-V) measurements for the high-temperature superconducting phase of polycrystalline YBa2 Cu3 Ox show loop behavior for temperatures below Tc . A thermal model has been constructed which shows that the loop is caused by a normal/superconducting interface, created by the heat at the solder junction, propagating down the sample. The importance of this effect to device applications and to critical current measurements is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343549
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  • 5
    Electronic Resource
    Electronic Resource
    Transport critical current densities of partially aligned bulk samples of YBa2Cu3O7−x superconductors (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 4178-4182 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Temperature and magnetic field dependence of critical current densities (Jc) of partially oriented bulk YBa2Cu3O7−x samples are presented. A series of partially oriented samples has been fabricated by repeating the steps of the solid-state reaction method. X ray and Raman studies detect the orientation of the grains on the surface and in the bulk of the samples. Jc increases with the degree of alignment of the microcrystals, up to a factor of three. The effect of partial bulk-preferred orientation on the critical current anisotropy is also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346232
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  • 6
    Electronic Resource
    Electronic Resource
    Measuring the homogeneity of ceramic superconductors by eddy current probing (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3417-3421 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The homogeneity of a bulk YBa2Cu3Ox sample prepared by standard methods has been determined. Measurements of the conductivity, Tc (by induction), and x-ray analysis showed no deviation from bulk material previously characterized as "homogeneous'' in the literature; the sample was shown to be inhomogeneous by the eddy current method. We use the sample's response to multifrequency eddy current probing as a measure of homogeneity. This response is calculated from measurements of the complex impedance of a coil, which contains the sample, as a function of frequency. The homogeneity of the sample after being quenched in air from three successively higher temperatures (650, 700, 800 °C) has also been determined. A rough conductivity profile in one dimension is obtained for all four sample conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143745
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  • 7
    Electronic Resource
    Electronic Resource
    Acoustic dimensional resonance tomography: Some examples in one-dimensional systems (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 55-58 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A spatial map of the variation of acoustic impedance within a material structure can be made using only its resonance frequencies. We demonstrate this for a 1-D rod having a diameter D which varies along its length l by determining D(l) from fundamental and overtone resonances. We also show how the technique can locate material/processing inhomogeneities in the elastic modulus and/or density on a scale of several parts per thousand for "stock'' rods of an aluminum alloy using nondestructive and noncontact testing. And finally, we apply dimensional resonance tomography in new measurement methods to obtain the thermal diffusivity along a rod and the heat transfer coefficient of the rod to its ambient. The latter technique provides quantitative data while allowing an arbitrary and unknown initial temperature distribution, requiring no temperature measurement or Fourier analysis, and can be done in noncontact fashion with the measurement of frequency and time, only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336838
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  • 8
    Electronic Resource
    Electronic Resource
    Anomalous behavior in transport critical current density of YBa2Cu3O7−x and YBa2Cu3O7−x-Ag bulk samples (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 863-866 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transport critical current density Jc versus temperature measurements on bulk YBa2Cu3O7−x and YBa2Cu3O7−x-Ag samples were carried out. An anomalous bifurcation in Jc-T curves was observed at temperatures between 55 and 88 K. The bifurcation was introduced by application of a transient pulse. The x-ray, scanning electron microscopy, and electron microprobe analysis results on these samples are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347324
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  • 9
    Electronic Resource
    Electronic Resource
    Correlation of Seebeck coefficient and electric conductivity in polyaniline and polypyrrole (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 3111-3117 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the Seebeck coefficient and electric conductivity in the air-stable conducting polymers polyaniline and polypyrrole at different doping levels. We find, at 300 K, the general correlation that the logarithm of the electrical conductivity varies linearly with the Seebeck coefficient on doping, but with a proportionality substantially in excess of a prediction from simple theory for a single type of mobile carrier. The correlation is unexpected in its universality and unfavorable in its consequences for thermoelectric applications. A standard model suggests that conduction by carriers of both signs may occur in these doped polymers, which thus leads to reduced thermoelectric efficiency. We also show that polyacetylene (which is not air stable), does exhibit the correlation with the expected proportionality, and, thus, its properties could be more favorable for thermoelectricity. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367119
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  • 10
    Electronic Resource
    Electronic Resource
    Modulated electric conductivity in Fe3O4/NiO superlattices (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2512-2513 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High quality Fe3O4/NiO multilayered structures with nominal artificial periodicity 17 A(ring)/ 17 A(ring) and 34 A(ring)/34 A(ring) have been made by molecular beam epitaxy. The conductivity of the modulated structures is orders of magnitude higher for current parallel to the layers than for the transverse direction, reaching a ratio of 106−a value which is comparable with the largest known anisotropy for any material. This strong anisotropy shows that a like modulation of electrical conductivity has been achieved over distances as small as tens of A(ring) and also suggests the possibility of voltage controlled superlattice phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104860
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