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  • 1
    Electronic Resource
    Electronic Resource
    Imaging high-temperature superconducting films (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7178-7181 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A magneto-optically active glass, Ce(PO3)3, was used to image field penetration into three superconducting films of YBa2Cu3O7 that were laser ablated on (100)-oriented SrTiO3 substrates. The magnetic-field profile in these films was mapped using the Faraday effect in an external field of 92 mT for two of the films and 181 mT for the third film. These contours show regions where flux had easily penetrated, indicating weak pinning, and other regions that were strongly pinning. From the measured field gradients, it was determined that Jc varies by at least an order of magnitude across the surface of the films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347610
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  • 2
    Electronic Resource
    Electronic Resource
    Role of bubbles in laser-assisted wet etching (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2851-2853 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Evidence is presented to explain laser-based aqueous salt etching in terms of vapor bubble growth conditions at the irradiated surface of a substrate. The effect of pulse and frequency modulation of a cw laser is investigated to determine growth behavior for adhering bubbles in pure water. The role of salt in solution (such as KOH, NaOH, or CaCl2) is discussed in terms of its function as a diffusion barrier for growing vapor bubbles. Etching data are presented for the case of a Cu-vapor laser applied to a Mn-Zn-ferrite substrate, comparing results with and without KOH in the etching solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104756
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  • 3
    Electronic Resource
    Electronic Resource
    Submicron YBa2Cu3O7−δ grain boundary junction dc SQUIDs (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2555-2557 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated and measured the properties of micron-size single grain boundary junctions and dc superconducting quantum interference devices (SQUIDs). The width of the junctions was varied between 0.25 and 2 μm. The junctions were formed in c-axis oriented epitaxial films with a single 24° tilt boundary. They were fabricated using electron beam lithography and ion milling. All of the junctions operate at 77 K. The noise properties of SQUIDs made of these junctions have been characterized. They show a significant 1/f component which is comparable to published values. However, the white noise level, 3×10−31 J/Hz measured at 77 K, is the lowest ever reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104824
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  • 4
    Electronic Resource
    Electronic Resource
    Crack formation in epitaxial [110] thin films of YBa2Cu3O7−δ and PrBa2Cu3O7−x on [110]SrTiO3 substrates (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1682-1684 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A characteristic feature of epitaxial [110] thin films of YBa2Cu3O7−δ and PrBa2Cu3O7−x on [110]SrTiO3 substrates is that the films have a tendency to crack along the (001) planes. We have studied the crack spacing as a function of deposition temperature and film thickness. The experimental data have been found to be in excellent agreement with a theoretical analysis of the crack spacings in brittle films. The study has allowed us to determine the critical thickness below which no cracks are expected to form as a function of temperature for [110] films of YBa2Cu3O7−δ, PrBa2Cu3O7−x, and YBa2Cu3O7−δ/ PrBa2Cu3O7−x bilayers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105110
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetization of a superconducting epitaxial (Y0.8Ca0.2)Ba2Cu3Ox film with O2 anneal : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5745-5747 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A c-axis epitaxial film of composition (Y0.8Ca0.2)Ba2Cu3O6+x is found to be superconducting over a wide range of oxygen stoichiometry, from x≈0 to x≈1.0. The oxygen stoichiometry was varied systematically by annealing films over four decades of oxygen partial pressure, ranging from 0.0067%–100% O2. Both the superconducting transition temperature and the remanent magnetization increase with increasing x and are approximately linear with log oxygen partial pressure over three decades. These increases are attributed mainly to the change in the number of holes in the Cu–O planes caused by oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350147
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  • 6
    Electronic Resource
    Electronic Resource
    Neutron measurements on an epitaxial thin film of YBaCuO : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5742-5744 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report evidence for an ordered flux line lattice in a 2-μm epitaxial film of YBaCuO from both neutron depolarization and diffraction measurements. Depolarization occurred when field cooling was done normal to the film plane but not within it; this is consistent with frozen-in vortices. Evidence for ordering of the flux lines comes from intensity maxima observed in difference patterns between field cooled and zero field cooled conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350146
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  • 7
    Electronic Resource
    Electronic Resource
    Field-effect conductance of YBa2Cu3O6 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4439-4441 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Metal-insulator-semiconductor field effect transistors have been fabricated using laser ablation to deposit YBaCuO thin films onto SrTiO3, MgO, LaAlO3, and LaGaO3 substrates. The substrates were used as gate insulators. The conductivity of two films on SrTiO3 could be modulated, while for other samples the conductivity was independent of the gate voltage. The field-effect mobility was extracted and found to be of magnitude comparable to the mobility of metallic YBa2Cu3O7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348373
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  • 8
    Electronic Resource
    Electronic Resource
    Magneto-optical characterization of YBa2Cu3O7 film uniformity (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1676-1678 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a magneto-optical technique, we have nondestructively imaged macroscopic variations in magnetic flux that penetrate laser-ablated, c-axis oriented, epitaxial YBa2Cu3O7 superconducting films deposited on crystalline (100)SrTiO3 substrates. Flux penetration into YBa2Cu3O7 films in an externally applied magnetic field is enhanced at crystalline substrate defect sites. A relationship between flux penetration and substrate defects is experimentally demonstrated with a YBa2Cu3O7 film deposited on an intentionally degraded crystalline SrTiO3 surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105108
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  • 9
    Electronic Resource
    Electronic Resource
    Laser deposition of YBa2Cu3O7−δ films using a pulsed oxygen source (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1211-1213 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of YBa2Cu3O7−δ (YBCO) have been grown by pulsed laser deposition in a low-pressure background (10−4–10−3 Torr) by using a pulsed, high intensity jet of O2 or N2O for oxidation. The oxygen source is provided by a pulsed molecular beam valve, and the opening of the valve and the triggering of the laser are synchronized with appropriate delay so that the supersonic gas jet and the ablated fragments arrive at the substrate at the same time. This provides the necessary oxygen to form the YBCO phase while maintaining a low oxygen background. The YBCO phase is not formed if the oxygen pulse is provided either before or much after the arrival of the ablation fragments at the substrate. The ability to grow superconducting films at low background pressures should allow usage of in situ analysis techniques, such as reflection high-energy electron diffraction, during pulsed laser deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104367
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  • 10
    Electronic Resource
    Electronic Resource
    Direct imaging of the fragments produced during excimer laser ablation of YBa2Cu3O7−δ (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1302-1304 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The evolution dynamics of the fragments produced during KrF excimer laser (248 nm, 25 ns) ablation of YBa2Cu3O7−δ has been observed by ultrafast photography using a synchronized dye laser beam (∼1 ns) to probe above the target surface. The images show that fragment removal is initiated near the beginning of the laser pulse ((approximately-greater-than)10 ns), continues for a maximum of a few hundred nanoseconds, and has an expansion front velocity suggesting a target temperature varying from about 1500 to 4000 K or greater. The shock wave formed due to interaction of the ablated fragments with background oxygen gas has also been photographed, and its temporal evolution as a function of oxygen pressure has been shown to agree better with a planar than spherical model. The overall picture is that of an ablation process showing pronounced but understandable gas-dynamic effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105481
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