Doping evolution of the superconducting gap structure in heavily hole-doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$: heat transport study

X. C. Hong, A. F. Wang, Z. Zhang +5

We performed systematic thermal conductivity measurements on heavily hole-doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ single crystals with 0.747 $\le x\le$ 0.974. At $x$ = 0.747, the $κ_0…