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  • 11
    Digitale Medien
    Digitale Medien
    Particulates reduction in laser-ablated YBa2Cu3O7−δ thin films by laser-induced plume heating (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2144-2146 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Experimental demonstration of reduction in the number and size of particulates formed in the laser ablation deposition of YBa2Cu3O7−δ thin films is obtained by the use of a second laser which further heats and fragments the blowoff material in the plume formed by the first laser. This results in a smoother film with higher critical current density as compared to that obtained without the second laser irradiation of the plume.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.103239
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  • 12
    Digitale Medien
    Digitale Medien
    Flux creep in Bi2Sr2CaCu2O8 epitaxial films (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1700-1702 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We incorporate the experimentally deduced flux line potential well structure into the flux creep model. Application of this approach to the resistive transition in Bi2Sr2CaCu2O8 epitaxial films explains the power law voltage-current characteristics and the nonlinear current dependence of the activation energy. The results cannot be accounted for by a transition into a superconducting vortex-glass phase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.103220
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  • 13
    Digitale Medien
    Digitale Medien
    Observation of shock waves and cooling waves in the laser ablation of Kapton films in air (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 569-571 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Deflections of a He-Ne laser beam in excimer and CO2 laser-produced plumes from Kapton films were measured. They show that in addition to the existence of a shock wave observed earlier, a slower cooling wave is also developed. A model calculation is presented which explains the present experimental data as well as previous results regarding the decrease of etching efficiency with increasing ambient gas pressure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.98350
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  • 14
    Digitale Medien
    Digitale Medien
    Epitaxial growth of YBa2Cu3O7−δ thin films on LiNbO3 substrates (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1261-1263 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: In situ epitaxial growth of YBa2Cu3O7−δ thin films on Y-cut LiNbO3 substrates using a standard laser ablation technique is reported. Resistance of the films shows a normal metallic behavior and a very sharp (〈1 K) superconducting transition with Tc(R=0) of 92 K. High critical current density of Jc(77 K)=2×105 A/cm2 is observed, which is in accordance with epitaxial growth. Film orientation observed from x-ray diffraction spectra indicates that the c axis is normal to the substrate plane and the a axis is at 45° to the [11.0] direction of the hexagonal lattice of the substrate with two domains in mirror image to the (110) plane.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.102470
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  • 15
    Digitale Medien
    Digitale Medien
    Flux creep characteristics in high-temperature superconductors (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 680-682 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We describe the voltage-current characteristics of YBa2Cu3O7−δ epitaxial films within the flux creep model in a manner consistent with the resistive transition behavior. The magnitude of the activation energy, and its temperature and magnetic field dependences, are readily derived from the experimentally observed power law characteristics and show a (1−T/Tc)3/2 type of behavior near Tc. The activation energy is a nonlinear function of the current density and it enables the determination of the shape of the flux line potential well.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.103310
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  • 16
    Digitale Medien
    Digitale Medien
    Epitaxial films of YBa2Cu3O7−δ on NdGaO3, LaGaO3, and SrTiO3 substrates deposited by laser ablation (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1054-1056 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Frequency-doubled Nd:YAG laser (532 nm) pulses of 1.7 J/cm2 and 10 ns duration were used to deposit thin films of YBa2 Cu3 O7−δ by laser ablation on NdGaO3 , LaGaO3, and SrTiO3 substrates held at 725±5 °C in 0.2 Torr of O2 ambient. Electrical resistivities versus temperature of all films show normal metallic behavior and sharp superconducting transitions with Tc (R=0) at 92–93 K. Critical current densities in 0.3–0.6 μm thick, 200 μm long, and 10–30 μm wide strips were measured to be 106 A/cm2 at 60, 77, and 80 K in the films on LaGaO3, NdGaO3, and SrTiO3, respectively. X-ray diffraction patterns show that all films grew epitaxially, with domains of only two crystalline orientations rotated 90° with respect to each other in the a-b plane (consistent with twins), and the c axis perpendicular to the substrates. The closely matched lattice constants of the film and substrates (0.8–2.1%) result in epitaxial growth of the films.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101559
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  • 17
    Digitale Medien
    Digitale Medien
    Highly oriented as-deposited superconducting laser ablated thin films of Y1Ba2Cu3O7−δ on SrTiO3, zirconia, and Si substrates (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2330-2332 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: KrF excimer laser ablation of an Y1Ba2Cu3O7−δ pellet in 0.1–0.2 Torr of O2 ambient was used to deposit thin superconducting films onto SrTiO3, yttria-stabilized zirconia (YSZ), and silicon substrates at 600–700 °C. The as-deposited 1-μm-thick films at 650–700 °C substrate temperature were superconducting, without further high-temperature annealing. All films had a similar Tc onset of ∼92 K but different zero-resistance Tc of 90, 85, and 70 K for the films on SrTiO3, YSZ, and Si substrates, respectively. Angular x-ray diffraction analysis showed that all the films were highly oriented with the c axis perpendicular to their surface. Critical current densities at 77 K were about 40 000 and 10 000 A/cm2 for the films on SrTiO3 and YSZ, respectively. Smooth surface morphology was observed in all films, with occasional defects and cracks in the films on YSZ, which seems to explain the lower critical current in these films.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.100515
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  • 18
    Digitale Medien
    Digitale Medien
    Y1Ba2Cu3O7−δ thin films grown by a simple spray deposition technique (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 163-165 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The preparation of high Tc superconducting thin films of Y1Ba2Cu3O7−δ on (100) single crystals of MgO, ZrO2 with 9% Y2O3 (yttria stabilized zirconia, or YSZ), and SrTiO3 using a simple spray deposition technique is described. Typical film growth procedure involves (a) the spraying of a stoichiometric solution of the nitrate precursors on the heated substrate (180 °C), (b) prebaking in air of the sprayed film (20 min at 500 °C), and (c) oven annealing of the film under flowing O2 (900–950 °C followed by slow cooling to 200 °C in about 3 h). X-ray diffraction analysis of the films after each of the growing steps mentioned above shows primarily the presence of crystalline phases of the nitrates, the oxides, and the orthorhombic superconducting phase, respectively. Resistivity versus temperature measurements show that the onset and completion of the superconductive transition occur at 92 and 87 K, respectively, in films on YSZ substrate; at 95 and 80 K, respectively, in films on SrTiO3 substrate; and at 82 and 77 K, respectively, in films on MgO substrate.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.99039
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  • 19
    Digitale Medien
    Digitale Medien
    Laser wavelength dependent properties of YBa2Cu3O7−δ thin films deposited by laser ablation (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2450-2452 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: YBa2Cu3O7−δ thin films were deposited onto (100) SrTiO3 substrates using 1064, 532, 355, 248, and 193 nm laser ablation. Transport measurements show lower normal-state resistivities and higher critical currents in films deposited by the shorter wavelength lasers. The surface morphology of the films was rough with large particulates when the 1064 nm laser was used whereas much smoother surfaces with fewer and smaller particulates were obtained with the UV lasers. It is suggested that the better film quality obtained when the UV lasers are used is due to a small absorption depth of the UV photons in the ceramic target and to higher absorption by the ablated fragments. This leads to smaller ablated species and further fragmentation in the hotter plume and, therefore, to smoother and denser films.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101999
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  • 20
    Digitale Medien
    Digitale Medien
    Deposition of epitaxial thin films of Nd1.85Ce0.15CuO4−y by laser ablation (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1795-1797 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Thin films of the electron-doped superconductor Nd1.85 Ce0.15 CuO4−y have been deposited on (100) SrTiO3 substrates at 780 °C using the laser ablation technique. The deposited films are very smooth and show epitaxial growth with the c axis normal to the substrate. The transport properties of the films are very sensitive to the concentration of oxygen vacancies. Films deposited and cooled in the presence of 150 mTorr O2 exhibit localization behavior with no evidence of superconductivity down to 5 K. Superconductivity is observed on vacuum annealing the films in situ after deposition. Films with optimum concentration of oxygen vacancies show a superconducting onset temperature of 21 K and Tc (R=0) of 20 K, with a critical current density of 2×105 A/cm2 at 5.5 K in zero magnetic field.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.102321
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