Measurement of Infrared Transition Spectrum of Synchrotron Radiation Through Superconducting YBa₂Cu₃O_7-δFilm

Abstract

This paper presents measurement results of the synchrotron radiation infrared transmission spectrum through YBCO film on MgO substrate at T = 20 K temperature. The film's transmission temperature of the superconducting state is Tc = 80 K. During formation cycle the maximum intensity wavelength varies from 100 µm to 10 µ.m. Due to spectrum evolution the detector signal that gives synchrotron radiation sample transmission is related to the sample transmission ability, the sensitivity of the detector and synchrotron radiation spectrum via an integral equation. The best agreement with experiment results is achieved for the E7 = 20 meV energy gap value, which corresponds to 2Eγ/kTc = 2.9 at T = 20 K.PACS numbers: 78.30.-j, 74.76.+w Middle and far range infrared (IR) spectroscopy have achieved good progress. There are used Fourier interferometers and black body radiation sources of T = 1000 -1500 K temperatures with p = 10 -8 W radiation power in the IWA = 0.1 region. A further increase in spectroscopic investigation efficiency depends on highly intensive radiation sources development in the λ. > 100 pm range.These sources can be cyclic electron accelerators (synchrotron radiation sources (SR) and variable magnetic structure sources (free electron lasers -FEL) [1].The difference between SR sources and a black body source in the far IR range is that the spectral density of the former decreases as A -1 while for the latter as A-3 [2].SR-source radiation flux was measured in the long wave region at the Brookhaven NSLS source [1]. The results showed that in the spectral range λ > 100 pm the power ratio of the synchrotron radiation to the black body radiation is PsL/Pb.b. = 10 [3].(893)