The Study of Quantum Critical Point In BaFe_2-x-yNi_xCr_yAs₂ Based Superconductors

Previous studies have shown that iron based superconductors may have antiferromagnetic and nematic quantum critical points, but it can not be observed directly due to the presence of superconductivity. Our previous works have shown that superconductivity in the BaFe_2-xNi_xAs₂ system can be suppressed by dopping a small amount of chromium. At the same time, the antiferromagnetic order changes from incommensure to commensure, from short-range to long-range. Therefore, the antiferromagnetic and the nematic quantum critical points may be studied by completely suppressing superconductivity. In this poster, I will show our recent results of the antiferromagnetic and nematic phases on the chromium dopped BaFe_2-xNi_xAs₂ by the electron resistance measurement.