Vibrating Reed Study of Superconducting Cuprates Fabricated by Superfast Melt Quenching in a Solar Furnace

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.

Superconducting Precursors in Bi/Pb Multiphase Cuprates Fabricated by the Solar Technology and their Comparative Study by Torque Magnetometry Methods

“…To determine the critical temperatures of the superconducting (SC) transitions T c of these samples obtained by this technology, the original torsional oscillation magnetometry method in applied magnetic fields was realized using an automated multipurpose device [6], which has a sensitivity comparable to that of a SQUID magnetometer. In [7][8], the potential possibilities of the Vibrating Reed (VR) magnetometry method for similar purposes were also investigated. The nature of SC precursors in cuprates was the subject of several studies [9][10][11][12].…”

A Simple and Fast Computation Equivalent Circuit Model to Investigate the Effect of Tape Twisting on the AC Loss of HTS Cables

“…Since the discovery of superconductors in 1911 by H. K. Onnes, many investigations were initiated to enhance the critical temperature of superconductors. In 1986, J. G. Bednorz and K. A. Müller have introduced new superconductors with a critical temperature near 30K [1]. This has led to the rapid development in the manufacturing of High Temperature Superconducting (HTS) tapes and wires.…”