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2 Nov 1987

Volume 51, Issue 18, pp. 1389-1467

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Ion beam amorphization of YBa2Cu3Ox

G. J. Clark, F. K. LeGoues, A. D. Marwick, R. B. Laibowitz, and R. Koch

Appl. Phys. Lett. 51, 1462 (1987); http://dx.doi.org/10.1063/1.98658 (3 pages) | Cited 52 times

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The microstructure of ion‐implanted thin films of the superconductor YBa2Cu3Ox has been investigated by transmission electron microscopy. The superconducting properties of the films were dominated by large pancake‐shaped grains of YBa2Cu3Ox with their c axis perpendicular to the substrate. Other grains of YBa2Cu3Ox whose c axis was parallel to the substrate formed spherulites. Irradiation with 500 keV O+ ions caused amorphous zones to appear on the grain boundaries between the pancake grains, which initially were free of amorphous or second phases. At higher dose a continuous amorphous layer 150 Å thick was formed. However, the interior of the grains showed no irradiation‐induced microstructural features until they became amorphous at a dose of 3×1014 ions/cm2. The appearance of the amorphous layer on the grain boundaries at low doses accounts for the reduction in the superconducting transition temperature observed in these films.
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68.55.-a Thin film structure and morphology
61.80.Jh Ion radiation effects
74.78.-w Superconducting films and low-dimensional structures
74.70.-b Superconducting materials other than cuprates

Measurement of gaseous oxygen using diode laser spectroscopy

M. Kroll, J. A. McClintock, and O. Ollinger

Appl. Phys. Lett. 51, 1465 (1987); http://dx.doi.org/10.1063/1.98999 (3 pages) | Cited 17 times

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A commercial diode laser emitting at ∼761 nm has been used to detect the absorption of individual rotational lines of the A band of atmospheric oxygen. An output signal that is proportional to the O2 partial pressure is extracted using derivative spectroscopy. The method allows measurement of O2 pressure with an uncertainty of ±1.3% of full scale (760 Torr) using a 1‐ms time constant.
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92.60.H- Atmospheric composition, structure, and properties
33.20.Ea Infrared spectra
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