Study of high-temperature superconductors by IBA methods

Abstract

The ion-induced electron emission (IIEE) technique to study the high- T c superconductor of the Y 1Ba 2Cu 3 O 7 − x type was used. The temperature dependence of the IIEE intensity I( T) within the range of 77–300 K was measured. The change of the shape of the I( T) curve at the point 140 K was observed. The ion-induced photon emission technique (IIPE) to study the same high-temperature superconductor was also used. The temperature dependence of the intensity of some emission lines (BaI — 455.5 nm, CuI — 324.7 nm, YI — 467.4 nm) was measured. No anomaly at the point 140 K was observed. The nonmonotonic dependence of the IIEE intensity on the target temperature and the behaviour of the temperature dependence of the IIPE intensity are discussed.