A Simple Urea Approach to N-Doped <i>α</i>-Mo<sub>2</sub>C with Enhanced Superconductivity

Longfu Li; Lei Shi; Lingyong Zeng; Kuan Li; Peifeng Yu; Kangwang Wang; Chao Zhang; Rui Chen; Zaichen Xiang; Yunwei Zhang; Huixia Luo

doi:10.1088/0256-307X/41/10/107401

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A Simple Urea Approach to N-Doped α-Mo₂C with Enhanced Superconductivity

1 School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Key Lab of Polymer Composite & Functional Materials, Sun Yat-Sen University, Guangzhou 510275, China;
2 School of Physics, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Sun Yat-Sen University, Guangzhou 510275, China

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Corresponding author:
Huixia Luo, Email: luohx7@mail.sysu.edu.cn

Received Date: August 11, 2024

Published Date: September 22, 2024

Abstract

Abstract

Chemical doping is a critical factor in the development of new superconductors or optimizing the superconducting transition temperature ( $T_{\rm c}$ ) of the parent superconducting materials. Here, a new simple urea approach is developed to synthesize the N-doped $\alpha$ -Mo $_{2}$ C. Benefiting from the simple urea method, a broad superconducting dome is found in the Mo $_{2}$ C $_{1-x}$ N $_{x}$ ( $0\leqslant x \leqslant 0.49$ ) compositions. X-ray diffraction results show that the structure of $\alpha$ -Mo $_{2}$ C remains unchanged and there is a variation of lattice parameters with nitrogen doping. Resistivity, magnetic susceptibility, and heat capacity measurement results confirm that $T_{\rm c}$ was strongly increased from 2.68 K ( $x=0$ ) to 7.05 K ( $x=0.49$ ). First-principles calculations and our analysis indicate that increasing nitrogen doping leads to a rise in the density of states at the Fermi level and doping-induced phonon softening, which enhances electron-phonon coupling. This results in an increase in $T_{\rm c}$ and a sharp rise in the upper critical field. Our findings provide a promising strategy for fabricating transition metal carbonitrides and provide a material platform for further study of the superconductivity of transition metal carbides.

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A Simple Urea Approach to N-Doped α-Mo₂C with Enhanced Superconductivity

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A Simple Urea Approach to N-Doped α-Mo₂C with Enhanced Superconductivity