Lattice paramenter, lattice disorder and resistivity of carbohydrate doepd MgB2 and their correlation with the transition temperature

TL;DR

This study investigates how carbohydrate doping affects the lattice parameters, disorder, resistivity, and transition temperature of MgB2, revealing linear correlations among these properties and their impact on superconductivity.

Contribution

It provides new insights into the effects of carbohydrate doping on MgB2's lattice structure and superconducting transition temperature, highlighting the importance of lattice disorder and resistivity.

Findings

Lattice parameters increase with sintering temperature.

Unit cell volume correlates linearly with critical temperature.

Residual resistivity is linearly related to transition temperature.

Abstract

The change in the lattice parameters or the lattice disorder is claimed as a cause of the slight reduction in the transition temperature by carbon doping in MgB2. In this work, an extensive investigation on the effects of carbohydrate doping has been carried out. It is found that not only the a-axis but also the c-axis lattice parameter increases with the sintering temperature. A linear relation between the unit cell volume and the critical temperature is observed. Compared with the well known correlation between the lattice strain and the critical temperature, the X-ray peak broadening itself shows a closer correlation with the transition temperature. The residual resistivity and the critical temperature are linearly correlated with each other as well and its implication is further discussed.