Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe${}_{0.875}$Ti${}_{0.125}$)${}_2$As${}_2$

Abstract

We report the crystal growth of a new hole-doped iron-based superconductor Ba(Fe${}_{0.875}$Ti${}_{0.125}$)${}_2$As${}_2$ by substituting Ti on the Fe site. The crystals are accidentally obtained in trying to grow Ni doped Ba${}_2$Ti${}_2$Fe${}_2$As${}_4$O. After annealing at 500 \textcelsius in vacuum for one week, superconductivity is observed with zero resistance at $T_{c0}\approx 17.5$ K, and about 20\% diamagnetic volume down to 2 K. While both the small anisotropy of superconductivity and the temperature dependence of normal state resistivity are akin to the electron doped 122-type compounds, the Hall coefficient is positive and similar to the case in hole-doped Ba${}_{0.9}$K${}_{0.1}$Fe${}_2$As${}_2$. The density functional theory calculations suggest dominated hole pockets contributed by Fe/Ti 3$d$ orbitals. Therefore, the Ba(Fe${}_{1-x}$Ti${}_x$)${}_2$As${}_2$ system provides a new platform to study the superconductivity with hole doping on the Fe site of iron-based superconductors.

8 pages, 4 figures

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