Prediction of phonon-mediated superconductivity in new Ti-based M[Formula: see text]AX phases.

Prediction of phonon-mediated superconductivity in new Ti-based M[Formula: see text]AX phases.
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DOI:
10.1038/s41598-022-17539-8
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发表时间:
2022-08-01
期刊:
影响因子:
4.6
通讯作者:
Probert, M. I. J.
Probert, M. I. J.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Karaca, E.;Byrne, P. J. P.;Hasnip, P. J.;Probert, M. I. J.

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用高通量计算方法对39个新的超导体进行了计算,并用密度泛函理论的电子-声子耦合计算对最佳候选超导体进行了详细的研究。详细的计算结果与简单的预测相吻合,并预测TiAlX(X:B,C和N)材料具有比目前已知的任何六角相都要高的值。费米能级上的电子态主要是Ti3D态。X(X:B,C和N)的选择对电子态密度有显著影响,但对声子特性影响不大。测得TiAlX(X:B,C和N)的电声子耦合系数分别为0.685,0.743和0.775,预测值分别为7.8K,10.8K和13.0K。
A high-throughput computational method is used to predict 39 new superconductors in the Ti-based MAX phases, and the best candidates are then studied in more detail using density functional theory electron–phonon coupling calculations. The detailed calculations agree with the simple predictions, and TiAlX (X: B, C and N) materials are predicted to have higher values of than any currently known hexagonal MAX phases. The electronic states at the Fermi level are dominated by the Ti 3d states. The choice of X (X: B, C and N) has a significant impact on the electronic density of states but not on the phonon characteristics. The electron–phonon coupling parameter for TiAlX (X: B, C and N) was determined to be 0.685, 0.743 and 0.775 with a predicted of 7.8 K, 10.8 K and 13.0 K, respectively.
DOI: 10.1088/1361-648x/aa8f79
发表时间: 2017-11-22
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