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31 Dec 1990

Volume 57, Issue 27, pp. 2873-2961

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Patterned YBa2Cu3O7−x thin films from photopolymerizable precursors

Yann Hung and John A. Agostinelli

Appl. Phys. Lett. 57, 2945 (1990); http://dx.doi.org/10.1063/1.104206 (3 pages) | Cited 1 time

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A technique which combines the fabrication and patterning of thin films of the high Tc superconductor YBa2Cu3O7−x has been developed. The technique possesses the essential features of the metalorganic decomposition method with the additional attribute that the metalorganic precursor is photopolymerizable. Patterns are generated directly in the precursor film using optical exposure through a mask followed by development in a solvent. A subsequent thermal treatment transforms the patterned precursor film to the oriented superconducting phase with c axis perpendicular to the substrate surface. Resistivity measurements for such a patterned film on a single crystal (100)MgO substrate show an onset to the superconducting state occurring at 85 K with zero resistivity below 67 K.
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74.78.-w Superconducting films and low-dimensional structures
74.25.-q Properties of superconductors
74.70.-b Superconducting materials other than cuprates
81.15.Lm Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids)

Phase alignment in Ag‐clad Bi‐Sr‐Ca‐Cu‐O (2:2:1:2) wires

R. D. Ray and E. E. Hellstrom

Appl. Phys. Lett. 57, 2948 (1990); http://dx.doi.org/10.1063/1.104207 (3 pages) | Cited 13 times

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Powder‐in‐tube wires that contained Bi, Sr, Ca, and Cu in a 2:2:1:2 mole ratio were drawn then rolled flat before processing. The superconducting phase was aligned with its c axis perpendicular to the wide plane of the wire by sintering the wires just below the melting point and by melt processing. Melt processing with slow cooling of the melt yielded the most alignment. Gravity did not influence alignment during melt processing.
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74.70.-b Superconducting materials other than cuprates
81.15.Lm Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids)

Growth and properties of YBa2Cu3O7 thin films on vicinal and polycrystalline MgO substrates

B. H. Moeckly, S. E. Russek, D. K. Lathrop, R. A. Buhrman, M. G. Norton, and C. B. Carter

Appl. Phys. Lett. 57, 2951 (1990); http://dx.doi.org/10.1063/1.104208 (3 pages) | Cited 12 times

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We discuss the results of a study on the growth by laser ablation of YBa2Cu3O7 thin films on polycrystalline and annealed vicinal (001) MgO substrates. In both instances the films were found to grow predominantly with the c axis normal to the plane of the substrate, regardless of the orientation of the MgO surface. In the case of the vicinal substrates the films were found to have superconducting properties comparable to those obtained with films grown on (001) oriented, annealed single‐crystal substrates.
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81.15.Gh Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, ALD, etc.)
74.78.-w Superconducting films and low-dimensional structures
81.15.Kk Vapor phase epitaxy; growth from vapor phase

Ruderman–Kittel coupling between ferromagnets separated by a nonmagnetic layer

W. Baltensperger and J. S. Helman

Appl. Phys. Lett. 57, 2954 (1990); http://dx.doi.org/10.1063/1.103737 (2 pages) | Cited 24 times

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For the coupling of two ferromagnets separated by a nonmagnetic layer, the Ruderman–Kittel [C. Kittel, Quantum Theory of Solids (Wiley, New York, 1963)] theory gives an expression which oscillates as a function of the thickness of the laser and asymptotically decreases as the reciprocal square of the thickness. The prefactor is independent of the electron density.
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75.10.Jm Quantized spin models, including quantum spin frustration
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
73.40.Ns Metal-nonmetal contacts
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)

High intensity electron channeling and perspectives for a bright tunable x‐ray source

H. Genz, H.‐D. Gräf, P. Hoffmann, W. Lotz, U. Nething, A. Richter, H. Kohl, A. Weickenmeier, W. Knüpfer, and J. P. F. Sellschop

Appl. Phys. Lett. 57, 2956 (1990); http://dx.doi.org/10.1063/1.103738 (3 pages) | Cited 3 times

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Using the continuous wave electron beam of the new Darmstadt superconducting electron accelerator and high intensity axial channeling in a diamond crystal, the possibility for the production of an intense tunable photon source in the x‐ray region is investigated. Due to low emittance of the machine and its high current it has become possible, for the first time, to produce channeling radiation in the energy region of a few keV with an intensity of up to 2×1010 photons/s in an x‐ray energy window of 10%. This is six orders of magnitude more than what has been observed previously.
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61.85.+p Channeling phenomena (blocking, energy loss, etc.)
79.20.Hx Electron impact: secondary emission
32.30.Rj X-ray spectra

In situ monitoring of a laser‐induced etched grating on InP: Thin‐film cell configuration

H. Grebel, B. Iskandar, P. Pien, and K. Sheppard

Appl. Phys. Lett. 57, 2959 (1990); http://dx.doi.org/10.1063/1.103739 (3 pages) | Cited 5 times

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On‐line, first‐order light diffraction from a laser‐induced etched grating in a thin‐film cell configuration is investigated. It is suggested that a layer of dissolved reaction products interferes with the in situ light scattering measurements.
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42.79.Dj Gratings
42.25.Fx Diffraction and scattering
85.40.Hp Lithography, masks and pattern transfer
81.65.-b Surface treatments
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