<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ta</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mi>CoSi</mml:mi></mml:mrow></mml:math> : A tantalum-rich superconductor with a honeycomb network structure

The crystal structure of solid-state materials with unique lattices is considered one the main factors determining physical properties, including superconductivity. Materials honeycomb have inspired intense research interest for their novel properties. A previously unknown compound, ${\mathrm{Ta}}_{4}\mathrm{CoSi}$, discussed herein, along its and superconducting It crystallizes in a $\mathrm{Cu}{\mathrm{Al}}_{2}\text{\ensuremath{-}}\mathrm{type}$ (space group P4/mcc, No. 124), lattice parameters $a=b=6.17755(7)\phantom{\rule{0.16em}{0ex}}\AA{}$ $c=4.98443(8)\phantom{\rule{0.16em}{0ex}}\AA{}$, featuring networks Ta-Ta (110) plane. Superconductivity observed below critical temperature \ensuremath{\sim}2.45 K, while lower upper magnetic fields are \ensuremath{\sim}9.86 mT 0.84 T, respectively. Experiments theoretical calculations show that significantly influence This material may thus provide new platform investigating exotic superconductivity networks.