Gap Anisotropy in Iron-Based Superconductors: A Point-Contact Andreev Reflection Study of BaFe${}_{2-x}$Ni${}_x$As${}_2$ Single Crystals

Cong Ren, Zhao-Sheng Wang, Zhen-Yu Wang +7

We report a systematic investigation on c-axis point-contact Andreev reflection (PCAR) in BaFe${}_{2-x}$Ni${}_x$As${}_2$ superconducting single crystals from underdoped to overdoped regi…