Topological Semimetal Transport Modulated by Interstitial Fe in Ba(Fe${}_{1-x}$Co${}_x$)${}_{2+\delta }As$_2$ Superconductors

Ze-Xian Deng, Qiang-Jun Cheng, Jing Jiang +14

Topological semimetals are renowned for exhibiting large, unsaturated magnetoresistance arising from ultrahigh carrier mobility and electron-hole compensation. However, such behavi…