Noise and structural characteristics of high-T c superconductor films and the numerical simulation of bolometers based on such films

Abstract

The structure, electrical properties, and noise characteristics of the epitaxial YBa2Cu3O7−x high-T c superconductor films grown by laser ablation and magnetron sputtering on CeO2/Al2O3 and LaAlO3 substrates have been studied. Experimental values of the film parameters (effective noise voltage V n, bolometer resistance R b, working temperature T b, etc.) were used to calculate the main characteristics of bolometers based on such films, intended for the absolute radiometry of synchrotron radiation in the 150–3000 eV range. Numerical estimates of the equivalent noise power, NEP Σ = 8 × 10−11−1.3 × 10−10 W/Hz0.5, show that the proposed films can be used for the creation of a high-precision absolute radiometer capable of detecting soft x-ray (synchrotron) radiation in a broad frequency range with a power of about 1 μW at an error not exceeding 1%.