YBaCuO films obtained by excimer laser ablation

Autor:	C M Rowan, R.J. Turner, T. Morrow, D.G. Walmsley, H. F. Sakeek
Rok vydání:	1992
Předmět:	Diffraction Cryostat Superconductivity Laser ablation Materials science Scanning electron microscope Mechanical Engineering Analytical chemistry Substrate (electronics) Condensed Matter Physics Wavelength Mechanics of Materials General Materials Science Spectroscopy
Zdroj:	Materials Science and Engineering: B. 13:15-19
ISSN:	0921-5107
DOI:	10.1016/0921-5107(92)90096-r
Popis:	YBaCuO films with (001) orientation have been deposited on MgO by laser ablation at 248 and 193 nm wavelengths. Transitions to zero resistance at 87 K and 90 K have been reproducibly achieved in the respective cases. Optical spectroscopy studies of the plume show the importance of molecular species in the ablate if good superconducting films are to be formed. The substrate position in the plume and the substrate temperature are important in determining film quality. The influence of oxygen gas pressure can be significant. Scanning electron microscopy studies show the occurrence of second-phase outcrops with a needle-like morphology aligned over the whole area of the film along two mutually perpendicular directions in the film surface. Film orientation is determined by X-ray diffraction and R vs. T is measured down to 80 K in a hydrogen exchange gas cryostat.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7a0d2192823c0adb92ffea3d2a73a0f5 https://doi.org/10.1016/0921-5107(92)90096-r Zobrazit plný text záznamu