Superconductivity and Charge Density Wave in Iodine-Doped CuIr<sub>2</sub>Te<sub>4</sub>
Mebrouka Boubeche, Jia Yu, Chushan Li, Wang Huichao, Lingyong Zeng, Yiyi He, Xiaopeng Wang, Wanzhen Su, Meng Wang, Dao‐Xin Yao, Zhijun Wang, Huixia Luo
Abstract
We report a systematic investigation on the evolution of the structural and physical properties, including the charge density wave (CDW) and superconductivity of the polycrystalline CuIr 2 Te 4− x I x for 0.0 ≤ x ≤ 1.0. X-ray diffraction results indicate that both of a and c lattice parameters increase linearly when 0.0 ≤ x ≤ 1.0. The resistivity measurements indicate that the CDW is destabilized with slight x but reappears at x ≥ 0.9 with very high T CDW . Meanwhile, the superconducting transition temperature T c enhances as x increases and reaches a maximum value of around 2.95 K for the optimal composition CuIr 2 Te 1.9 I 0.1 followed by a slight decrease with higher iodine doping content. The specific heat jump (Δ C / γT c ) for the optimal composition CuIr 2 Te 3.9 I 0.1 is approximately 1.46, which is close to the Bardeen–Cooper–Schrieffer value of 1.43, indicating that it is a bulk superconductor. The results of thermodynamic heat capacity measurements under different magnetic fields [ C p ( T , H )], magnetization M ( T , H ) and magneto-transport ρ ( T , H ) measurements further suggest that CuIr 2 Te 4− x I x bulks are type-II superconductors. Finally, an electronic phase diagram for this CuIr 2 Te 4− x I x system has been constructed. The present study provides a suitable material platform for further investigation of the interplay of the CDW and superconductivity.