The Influence of the Bulk Density on the Intergranular Properties of YBa2Cu3-xFexOy (0<x<0.01) Ceramics

TL;DR

This study investigates how the bulk density of YBa2Cu3-xFexOy ceramics affects their intergranular superconducting properties, revealing that density influences hysteresis losses and shielding capability, with implications for optimizing superconductor performance.

Contribution

It provides new insights into how bulk density impacts intergranular superconducting properties and vortex pinning in YBa2Cu3-xFexOy ceramics.

Findings

Increasing density shifts Tm(J) to lower temperatures.

Shielding capability at 78K is twice as high in lower-density samples.

Shielding capability and Tm(J) plateau in the 0.003 < X < 0.007 range.

Abstract

The influence of the bulk density of YBa2Cu3-xFexOy (0 < x < 0.01) ceramics on the intergranular superconducting (SC) properties was studied using the temperature dependence of AC magnetic susceptibility measurements. It was found that the simultaneous variation of the sample's density and the iron impurity concentration does not influence effectively the onset temperature of the superconducting state Tc(on). While only increasing of the sample's density shifts the intergranular hysteresis losses peak temperature Tm(J) to the lower values which connects with the decreasing of the Josephson magnetic vortices pinning role. It was established that the shielding capability and Tm(J) display a plateau with X in the 0.003 < X < 0..007 region which is due to the monotonous decrease of the sample's density. It was shown that the shielding capability at the T=78K for the sample with 3.8g/cm3 is two times higher than that for the sample with the density of 5.0g/cm3. The possible interpretations of the observed results are discussed.