Superconducting Properties of adipic acid doped Bulk MgB2 Superconductor

TL;DR

This study investigates how adipic acid doping affects the structural and superconducting properties of MgB2, revealing significant improvements in critical current density and irreversibility field at high magnetic fields.

Contribution

It demonstrates that adipic acid doping induces carbon substitution in MgB2, enhancing its superconducting performance under high magnetic fields, which is a novel approach for improving MgB2 superconductors.

Findings

Doping reduces Tc and lattice parameter a, indicating carbon substitution.

Doped samples show an order of magnitude higher Jc at 5 K and 8 T.

Adipic acid is effective for enhancing high-field superconducting properties.

Abstract

We report the effect of adipic acid (C6H10O4) doping on lattice parameters, microstructure, critical temperature (Tc), current density (Jc), and irreversibility field (Hirr) for MgB2 superconductor. Actual carbon (C) substitution level for boron (B) is estimated to be from 0.40 percent to 2.95 percent for different doping levels. A reduction in Tc from 38.43 to 34.93 K and in lattice parameter a from 3.084(3) A to 3.075(6) Ais observed for the10 wt percent C6H10O4 doped sample in comparison to pristine MgB2. This is an indication of C substitution at boron sites, with the C coming from the decomposition of C6H10O4 at the time of reaction. Interestingly the doped samples have resulted in significant enhancement of Jc and Hirr. All the doped samples exhibit the Jc value of the order of 10^4 A/cm2 at 5 K and 8 T, which is higher by an order of magnitude as compared to undoped sample. This result indicates that C6H10O4 is a promising material for MgB2 for obtaining the excellent Jc values under higher magnetic fields.