Superconductivity induced by Ni doping in BaFe$_2$As$_2$

Details Superconductivity induced by Ni doping in BaFe$_2$As$_2$ Superconductivity induced by Ni doping in BaFe$_2$As$_2$

2008-09-11

arxiv.org/abs/0809.2009v2

New J. Phys. 11 (2009) 025008

Physics

Condensed Matter

Superconductivity

7 pages, 5 figures, revised version, added EDX result, accepted for special issue of NJP

Scientific paper

10.1088/1367-2630/11/2/025008

A series of 122 phase BaFe$_{2-x}$Ni$_x$As$_2$ ($x$ = 0, 0.055, 0.096, 0.18, 0.23) single crystals were grown by self flux method and a dome-like Ni doping dependence of superconducting transition temperature is discovered. The transition temperature $T_c^{on}$ reaches a maximum of 20.5 K at $x$ = 0.096, and it drops to below 4 K as $x$ $\geq$ 0.23. The negative thermopower in the normal state indicates that electron-like charge carrier indeed dominates in this system. This Ni-doped system provides another example of superconductivity induced by electron doping in the 122 phase.

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