Abstract
In this study, the potential possibilities of the precision of the vibrating reed method for the evaluation of the Тс of superconducting precursors in an HTSC Bi-Pb-Sr-Cu-O system were investigated. A special technology for obtaining these samples by using solar energy for melting and following superfast melt quenching was applied to increase their internal inhomogeneity, allowing to receive high-quality textural ceramic samples of Bi1,7Pb0,3Sr2Can-1CunOy (n=2-30) showing critical temperatures of superconducting precursor transitions above bulk Тс. To determine critical temperatures of superconducting precursors above bulk Тс for the first time, the original vibrating reed method of studying these multiphase samples in an applied magnetic field was used. It was shown that this method has sensitivity to superconducting diamagnetism making possible to reveal new superconducting precursor phases above bulk Tc.
Highlights
After the discovery of high-temperature superconductors (HTSC) in 1986, great efforts were made to the further increase the critical temperature of superconducting transition Тс with aim to reach room temperatures
We investigated the potential possibilities of the vibrating reed method for the evaluation of Тс of superconducting precursors in an HTSC Bi-Pb-Sr-Cu-O system
We applied a special technology for obtaining these samples using solar energy for their melting and subsequent uperfast melt quenching for increasing their internal inhomogeneity, allowing the receiving of high-quality textural ceramic samples of the Bi1,7Pb0,3Sr2Can-1CunOy (n=2-30) system showing critical temperatures of superconducting precursor transitions above bulk Тс
Summary
After the discovery of high-temperature superconductors (HTSC) in 1986, great efforts were made to the further increase the critical temperature of superconducting transition Тс with aim to reach room temperatures Such a discovery would cause the emergence of new HTSC materials with Тс higher than the ones of liquid nitrogen (~77K) and hydrogen (19К) (Tc in YBaCuO and MgB2, correspondingly) opening great possibilities for their applications in electronics and energetics. The concentration of new HTSC phases appeared to be so small that for more precision assessments it was necessary to find alternative and more sensitive methods. One of such methods could be the vibration reed (VR) method for the first time developed in works of our group and independently [7]. As the frequency and dissipation of VR could be measured with high precision, the VR method exceeds in sensitivity a conventional ac-
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