IrTe2 with large spin-orbital coupling (SOC) shows a CDW-like first order structural phase transition from high-temperature trigonal phase to low-temperature monoclinic phase at 270 K, accompanying with a large jump in transport and magnetic measurement as well as in heat capacity. Here, the 3d element Ni has been doped into IrTe2 by growing Ir1−xNixTe2 single crystals. Both XRD and XPS results reveal that the Ni atoms have substituted for Ir, which is consistent with the calculation result. Like the CDW behaviour, the structural phase transition shows competition and coexistence with the superconductivity. The monoclinic phase transition has been suppressed gradually with the increase of the doping amount of Ni, at last giving rise to the stabilization of the trigonal phase with superconductivity. Within 0.1≤x≤0.2, Ir1−xNixTe2 shows the superconductive behaviour with Tc around 2.6K. The superconductivity shows anisotropy with dimensionless anisotropy parameter γ=ξ///ξ⊥∼ 2. Even Ni element shows ferromagnetic behaviour, Ir1−xNixTe2 only shows weak paramagnetism, no ferromagnetic order is observed in it, which is coincident with the calculation result that their up and down spin density of states compensate each other well. In addition, for other 3d elements Fe, Co and Mn doped IrTe2, only Ir1−xMnxTe2 owns magnetism with magnetic moment of 3.0μB to the supercell, theoretically.
@article{arxiv.2011.06720,
title = {Discovery of the Superconductivity in 3d Element Ni doped IrTe$_2$},
author = {Qiang Jing and Ping Li and Yunze Long and Jingfeng Wang and Fei Jiao and Xiaoxiong Wang and Xiaomin Cui and Wenxiang Jiang and Guohua Wang and Yunlong Li and Gan Liu and Cao Wang and Bo Liu and Dong Qian},
journal= {arXiv preprint arXiv:2011.06720},
year = {2020}
}