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

李龙夫 ¹石磊 ²曾令勇 ¹李宽 ¹余沛峰 ¹王康旺 ¹张超 ¹陈睿 ¹项载琛 ¹张云蔚 ²罗惠霞¹

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作者信息

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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Abstract

Chemical doping is a critical factor in the development of new superconductors or optimizing the supercon-ducting transition temperature(Tc)of the parent superconducting materials.Here,a new simple urea approach is developed to synthesize the N-doped α-Mo2C.Benefiting from the simple urea method,a broad superconducting dome is found in the Mo2C1-xNx(0 ≤ x ≤ 0.49)compositions.X-ray diffraction results show that the structure of α-Mo2C remains unchanged and there is a variation of lattice parameters with nitrogen doping.Resistiv-ity,magnetic susceptibility,and heat capacity measurement results confirm that Tc was strongly increased from 2.68K(x=0)to 7.05K(x=0.49).First-principles calculations and our analysis indicate that increasing nitro-gen 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 Tc 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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基金项目

National Natural Science Foundation of China(12274471)

National Natural Science Foundation of China(11922415)

Guangdong Basic and Applied Basic Research Foundation(2022A1515011168)

Key Research & Development Program of Guangdong Province,China(2019B110209003)

Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices(2022B1212010008)

Postdoctoral Fellowship Program of CPSF(GZC20233299)

Fundamental Research Funds for the Central Universities,Sun Yat-Sen University(29000-31610058)

出版年

2024

中国物理快报(英文版)

中国科学院物理研究所,中国物理学会

中国物理快报(英文版)

CSTPCDCSCDEI

影响因子：0.515

ISSN：0256-307X

参考文献量56

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