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Gap Structure of the Overdoped Iron-Pnictide Superconductor Ba(Fe_(0.942)Ni_(0.058))₂As₂: A Low-Temperature Specific-Heat Study

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arxiv 1507.06417 v1 pith:GKVGRWR6 submitted 2015-07-23 cond-mat.supr-con

Gap Structure of the Overdoped Iron-Pnictide Superconductor Ba(Fe_(0.942)Ni_(0.058))₂As₂: A Low-Temperature Specific-Heat Study

Gang Mu , Bo Gao , Xiaoming Xie , Yoichi Tanabe , Jingtao Xu , Jiazhen Wu , Katsumi Tanigaki This is my paper
classification cond-mat.supr-con
keywords low-temperatureoverdopedsuperconductortemperatureanalysisbesidesclearco-doped
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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