Journal of Applied Physics

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On the proximity effect between normal metals and cuprate superconductors
Journal of Applied Physics - Tập 69 Số 7 - Trang 4137-4139 - 1991
G. Deutscher, R. W. Simon
We consider the proximity effect between high-temperature superconducting cuprates and ordinary metals in the context of superconductor-normal-superconductor (S-N-S) microbridges. The theory of the proximity effect for conventional superconductors predicts that superconductivity can only be weakly induced by the coupling of the cuprates with metals such as gold or silver. Experimental inve...... hiện toàn bộ
Properties of TiO2-based transparent conducting oxide thin films on GaN(0001) surfaces
Journal of Applied Physics - Tập 107 Số 5 - 2010
Junpei Kasai, Taro Hitosugi, Miki Moriyama, Koichi Goshonoo, Ngoc Lam Huong Hoang, Satoshi Nakao, Naoomi Yamada, Tetsuya Hasegawa
Anatase Nb-doped TiO2 transparent conducting oxide has been formed on GaN(0001) surfaces using a sputtering method. Amorphous films deposited at room temperature were annealed at a substrate temperature of 500 °C in vacuum to form single-phase anatase films. Films with a thickness of 170 nm exhibited a resistivity of 8×10−4 Ω cm with absorptance less than 5% at a wavelength of 460 nm. Furt...... hiện toàn bộ
Growth modes and microstructures of ZnO layers deposited by plasma-assisted molecular-beam epitaxy on (0001) sapphire
Journal of Applied Physics - Tập 90 Số 10 - Trang 5115-5119 - 2001
F. Vigué, P. Vennéguès, C. Deparis, S. Vézian, M. Laügt, J. P. Faurie
Transmission electron microscopy and high resolution x-ray diffraction are used to characterize defects in ZnO layers grown by plasma-assisted molecular-beam epitaxy on (0001) sapphire. Two- and three-dimensional types of growth modes are described and the observed mosaic structure is analyzed in each case. It is found that two-dimensional layers exhibit a roughness as low as 6 nm. Their s...... hiện toàn bộ
Formation of Ti–Zr–Cu–Ni bulk metallic glasses
Journal of Applied Physics - Tập 78 Số 11 - Trang 6514-6519 - 1995
Xiaomin Lin, William L. Johnson
Formation of bulk metallic glass in quaternary Ti–Zr–Cu–Ni alloys by relatively slow cooling from the melt is reported. Thick strips of metallic glass were obtained by the method of metal mold casting. The glass forming ability of the quaternary alloys exceeds that of binary or ternary alloys containing the same elements due to the complexity of the system. The best glass forming alloys su...... hiện toàn bộ
Detection and size determination of Ag nanoclusters in ion-exchanged soda-lime glasses by waveguided Raman spectroscopy
Journal of Applied Physics - Tập 79 Số 4 - Trang 2055-2059 - 1996
Maurizio Ferrari, F. Gonella, M. Montagna, C. Tosello
Waveguided Raman measurements have been performed in order to detect the presence of Ag nanoclusters in soda-lime glass waveguides obtained by ion exchange. By subtracting a strong broadband luminescence and the Raman contribution of the glass matrix, a low frequency Raman peak is resolved. The peak is ascribed to surface acoustic vibrations of silver clusters. The involved modes are the q...... hiện toàn bộ
Geometrical Representation of the Schrödinger Equation for Solving Maser Problems
Journal of Applied Physics - Tập 28 Số 1 - Trang 49-52 - 1957
Richard P. Feynman, F. L. Vernon, R. W. Hellwarth
A simple, rigorous geometrical representation for the Schrödinger equation is developed to describe the behavior of an ensemble of two quantum-level, noninteracting systems which are under the influence of a perturbation. In this case the Schrödinger equation may be written, after a suitable transformation, in the form of the real three-dimensional vector equation dr/dt=ω×r, where the comp...... hiện toàn bộ
Use of digital image analysis to estimate fluid permeability of porous materials: Application of two-point correlation functions
Journal of Applied Physics - Tập 60 Số 6 - Trang 1930-1938 - 1986
James G. Berryman, Stephen C. Blair
Scanning electron microscope images of cross sections of several porous specimens have been digitized and analyzed using image processing techniques. The porosity and specific surface area may be estimated directly from measured two-point spatial correlation functions. The measured values of porosity and image specific surface were combined with known values of electrical formation factors...... hiện toàn bộ
Photoemission from transition metals and their compounds
Journal of Applied Physics - Tập 59 Số 6 - Trang R25-R64 - 1986
L. C. Davis
Photoemission experiments on 3d transition metals are reviewed. The emphasis is on understanding the results of experiments, not on experimental details and methods. Extensive use is made of simple models. Much of the review pertains to resonances associated with the autoionization 3p53dn+1 →3p63dn−1 +e and their implications for electronic structure. Nonresonant ultraviolet and x-ray phot...... hiện toàn bộ
Mechanism of Photoconductivity in Microcrystalline Powders
Journal of Applied Physics - Tập 31 Số 12 - Trang 2239-2254 - 1960
Richard H. Bube
Measurements on a variety of cadmium sulfide powder cells show that there are four different regions encountered as the applied voltage is varied. At low voltages an ohmic region is found in which barrier breakdown does not occur. At intermediate voltages a region is found in which barrier breakdown by a Process I occurs. At still higher voltages a region is found in which barrier breakdow...... hiện toàn bộ
Dynamics of flame propagation using laser-induced spark initiation: Ignition energy measurements
Journal of Applied Physics - Tập 64 Số 3 - Trang 1499-1507 - 1988
Jack A. Syage, E. W. Fournier, R. Rianda, Randolph B. Cohen
A method is described for measuring low-energy ignition of combustable mixtures using nanosecond and picosecond laser-induced breakdown. Ignition studies are reported for homogeneous H2/air mixtures. The extent of flame inhibition in H2/air was investigated as a function of CO2 concentration. Our electrodeless spark ignition results are compared with earlier work using electric discharge i...... hiện toàn bộ
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