Weak gravitation shielding properties of composite bulk YBa_2Cu_3O_{7-x} superconductor below 70 K under e.m. field

TL;DR

This study investigates the weak gravitational shielding effects of a composite YBa_2Cu_3O_{7-x} superconductor below 70 K, demonstrating measurable weight loss under specific electromagnetic conditions.

Contribution

It presents experimental evidence of gravitational shielding in a high-temperature superconductor with composite structure, a novel observation in superconductor research.

Findings

Weight loss of 0.3-0.5% observed during initial tests

Maximum shielding effect reached 2.1% with controlled rotation speed

Shielding effect varies with electromagnetic conditions

Abstract

A high-temperature YBa_2Cu_3O_{7-x} bulk ceramic superconductor with composite structure has revealed weak shielding properties against gravitational force while in a levitating state at temperatures below 70 K. A toroidal disk was prepared using conventional ceramic technology in combination with melt-texture growth. Two solenoids were placed around the disk in order to initiate the current inside it and to rotate the disk about its central axis. Samples placed over the rotating disk initially demonstrated a weight loss of 0.3-0.5%. When the rotation speed was slowly reduced by changing the current in the solenoids, the shielding effect became considerably higher and reached 1.9-2.1% at maximum.