%0 Journal Article %T Gap Structure of the Overdoped Iron-Pnictide Superconductor Ba(Fe$_{0.942}$Ni$_{0.058}$)$_{2}$As$_{2}$: A Low-Temperature Specific-Heat Study %A Gang Mu %A Bo Gao %A Xiaoming Xie %A Yoichi Tanabe %A Jingtao Xu %A Jiazhen Wu %A Katsumi Tanigaki %J Physics %D 2015 %I arXiv %R 10.1155/2015/419017 %X Low-temperature specific heat (SH) is measured on the postannealed Ba(Fe_{1-x}Ni_x)_2As_2 single crystal with x = 0.058 under different magnetic fields. The sample locates on the overdoped sides and the critical transition temperature is determined to be 14.8 K by both the magnetization and SH measurements. A simple and reliable analysis shows that, besides the phonon and normal electronic contributions, a clear T2 termemerges in the low temperature SH data.Our observation is similar to that observed in the Co-doped system in our previous work and is consistent with the theoretical prediction for a superconductor with line nodes in the energy gap. %U http://arxiv.org/abs/1507.06417v1