Gap structure of the overdoped iron-pnictide superconductor Ba(Fe0.942Ni0.058)2as2: A low-temperature specific-heat study

Gang Mu, Bo Gao, Xiaoming Xie, Yoichi Tanabe, Jingtao Xu, Jiazhen Wu, Katsumi Tanigaki

Research output: Contribution to journalArticlepeer-review


Low-temperature specific heat (SH) is measured on the postannealed Ba(Fe1-xNix)2As2 single crystal with x = 0.058 under different magnetic fields. The sample locates on the overdoped sides and the critical transition temperature T c 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 term emerges 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.

Original languageEnglish
Article number419017
JournalAdvances in Condensed Matter Physics
Publication statusPublished - 2015

ASJC Scopus subject areas

  • Condensed Matter Physics

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