Physical Sciences and Mathematics Commons^™

Reduction Of Superconducting Transition Temperature And Flux Pinning In Al And C Codoped Mgb2 With Insight From First-Principles Calculations, Aihua Li, Xiaolin Wang, S X. Dou, Qiwen Yao, Zhenxiang Cheng, Saeid Soltanian, J M. Yoo, P Munroe

Australian Institute for Innovative Materials - Papers

We report for the first time the Al and C codoping effect on the structures and superconductivity in MgB₂. It was found that both the lattice parameters and the T_c decreased monotonically with increasing doping level of both Al and C. The T_c dropped to 27.5 and 7 K for x=0.2 and for x =0.4, respectively. The reduction of T_c for the codoping was found to be quicker than for individual Al doping and slower than for individual C doping at the same doping levels. First-principles calculations indicated that the observed decrease in T_{c …}