A MODEL OF STRUCTURAL DISORDER IN (Ba2Cu2O4+x)/(CaCuO2)n SUPERLATTICES

Autor:	Antonello Tebano, G. Pasquini, G. Petrocelli, Giuseppe Balestrino, S. Lavanga, Pier Gianni Medaglia
Rok vydání:	2000
Předmět:	Superconductivity Materials science Reflection high-energy electron diffraction Condensed matter physics Superlattice Dispersion (optics) Layer by layer Statistical and Nonlinear Physics Composition (combinatorics) Condensed Matter Physics Spectral line Order of magnitude
Zdroj:	International Journal of Modern Physics B. 14:2719-2724
ISSN:	1793-6578 0217-9792
DOI:	10.1142/s021797920000282x
Popis:	The structural disorder in ( Ba 2 Cu 2 O 4+x )/( CaCuO 2) n superlattices with ultrathin individual layers was investigated. Numerical simulations of x-ray spectra were carried out following a kinematical approach in a simplified model structure. The model assumes a two-dimensional layer by layer growth in which mixed composition layers can be corrugated to adjust the internal stresses due to the large mismatch between the constituent oxides. An additional random disorder is added to take into account the experimental dispersion in the amount of material deposited in each iteration. The model was successfully used to simulate x-ray spectra for samples with non integer n ranging from 2 to 16, grown in optimal conditions to obtain a superconducting behavior. The same model was used to simulate spectra of samples grown at lower pressures monitored with in-situ RHEED diagnostic. In this case, random disorder results more than one order of magnitude smaller.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::275e392e1b340a1e119fa9819ff8e8e8 https://doi.org/10.1142/s021797920000282x Zobrazit plný text záznamu