| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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A Simple Urea Approach to N-Doped $\alpha$-Mo$_{2}$C with Enhanced Superconductivity |
| Longfu Li1, Lei Shi2, Lingyong Zeng1, Kuan Li1, Peifeng Yu1, Kangwang Wang1, Chao Zhang1, Rui Chen1, Zaichen Xiang1, Yunwei Zhang2, and Huixia Luo1* |
1School 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
2School of Physics, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Sun Yat-Sen University, Guangzhou 510275, China
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| Cite this article: |
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Longfu Li, Lei Shi, Lingyong Zeng et al 2024 Chin. Phys. Lett. 41 107401 |
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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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Received: 12 August 2024
Published: 26 October 2024
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| PACS: |
74.70.Dd
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(Ternary, quaternary, and multinary compounds)
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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74.25.F-
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(Transport properties)
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74.62.Dh
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(Effects of crystal defects, doping and substitution)
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74.62.-c
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(Transition temperature variations, phase diagrams)
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