Showing papers by "Richard E. Russo published in 1991"
TL;DR: In this paper, the effect of sample transport characteristics, laser power density, condition of sample surface and the pressure pulse generated by the expansion of laser plasma was described using inductively coupled plasma-atomic emission spectrometry (ICP-AES).
88 citations
TL;DR: In this article, a pulsed laser deposition process was used to grow controlled-orientation yttria-stabilized zirconia (YSZ) films as intermediate layers on Haynes Alloy No. 230.
Abstract: The use of an intermediate layer is necessary for the growth of YBaCuO thin films on polycrystalline metallic alloys for tape conductor applications. A pulsed laser deposition process to grow controlled‐orientation yttria‐stabilized zirconia (YSZ) films as intermediate layers on Haynes Alloy No. 230 was developed and characterized. YBaCuO films deposited on these YSZ‐coated substrates are primarily c‐axis oriented and superconducting as deposited. The best YBaCuO films grow on (001) oriented YSZ intermediate layers and have Tc (R=0) = 86.0 K and Jc ∼ 3×103 A/cm2 at 77 K.
62 citations
TL;DR: In this paper, the mirage effect within a transparent solid substrate was used for monitoring optical absorption of a thin film, and the spectrum of copper, deposited onto a piece of clear acrylic, was recorded by photothermal deflection.
Abstract: The mirage effect within a transparent solid substrate was used for monitoring optical absorption of a thin film. Refractive index gradients, which accompany thermal gradients below the film‐coated surface, cause a probe laser beam to be deflected. The spectrum of copper, deposited onto a piece of clear acrylic, was recorded by this method of photothermal deflection. The influence of thermally induced mechanical stresses can alter the effective value of the thermo‐optic coefficient of the solid, dn/dT.
29 citations
15 citations
TL;DR: The reproducible zero resistance temperature of these films is 62 K with J c of approximately 620 A/cm 2 at 30 K as mentioned in this paper, which is the state-of-the-art for superconducting thin films.
Abstract: BiPbSbSrCaCuO superconducting thin films were grown as deposited using pulsed laser deposition on polycrystalline metallic alloy substrates with yttria-stabilized zirconia (YSZ) intermediate layers. YSZ intermediate layers have ( 111 ) direction perpendicular to alloy surface as determined by X-ray diffraction measurements. X-ray diffraction data show that the BiPbSb SrCaCuO films are c -axis oriented and contain primarily the 2212 phase with minor 2201 and CuO phases. Following an onset of superconducting transition above 90 K, the reproducible zero resistance temperature of these films is 62 K with J c of approximately 620 A/cm 2 at 30 K.
6 citations
01 Jan 1991
TL;DR: Among vibrational spectroscopies, Raman spectroscopy is a powerful analytical investigation technique for studying phonons in solids with relatively simple instrumentation as mentioned in this paper, which can provide various types of information, for instance, concerning the behavior of the oxygen atoms or information about the electronic band structure.
Abstract: Among vibrational spectroscopies, Raman spectroscopy is a powerful analytical investigation technique for studying phonons in solids with relatively simple instrumentation. Raman scattering can provide various types of information, for instance, concerning the behavior of the oxygen atoms or information about the electronic band structure. As soon as high temperature superconductivity in La1-xBaxCuO4 was discovered by Bednorz and Muller,1 Raman spectra have been studied to determine the structure, composition, and phases of these perovskite-like superconducting copper oxides.
5 citations
01 Jan 1991
TL;DR: In this article, inductively coupled plasma-atomic emission spectroscopy was used for the study of the explosive removal of solid material by high power pulsed laser radiation, and the effect of sample transport characteristics, laser power density and the pressure pulse generated by the expansion of laser plasma were discussed.
Abstract: Inductively coupled plasma-atomic emission spectroscopy was used for the study of the explosive removal of solid material by high power pulsed laser radiation. The effect of sample transport characteristics, laser power density, and the pressure pulse generated by the expansion of laser plasma are discussed.
4 citations
01 Jan 1991
TL;DR: In this article, the shape, magnitude, and phase of a photothermal deflection (PTD) signal due to changes in the thermophysical properties of the target and deflecting medium, and the distance of the probe beam from the surface, were analyzed.
Abstract: Numerical and experimental work is presented to show the effects on the shape, magnitude, and phase of a photothermal deflection (PTD) signal due to changes in the thermophysical properties of the target and deflecting medium, and the distance of the probe beam from the surface. The PTD signals show qualitative agreement with the temperature gradient normal to the surface, calculated with a numerical model. The results also show that a maximum in time-response profile of the PTD signal occurs in certain instances due to asymmetric changes in the temperature field over time. The effect of a changing temperature field on the PTD signal may be used to detect the onset of phase change in a target.
4 citations
01 Mar 1991
TL;DR: Very high critical current densities are exhibited by epitaxial thinfilms of the high-temperature superconductors (on single-crystal======substrates).
Abstract: Very high critical current densities are exhibited by epitaxial thin
films of the high-temperature superconductors (on single-crystal
substrates). Can similar high-current densities be achieved in the
form of thin films on large-area polycrystalline substrates? If so,
high-current superconducting tapes can be fabricated. We examine the
arguments for and against this approach and briefly review the progress
to date, in our laboratory and elsewhere, toward achieving flexible
high-current tapes.