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Superconductivity in chromium nitrides Pr3Cr10-xN11 with strong electron correlations
National Science Review ( IF 20.6 ) Pub Date : 2019-09-02 , DOI: 10.1093/nsr/nwz129 Wei Wu 1, 2 , Kai Liu 3 , Yanjie Li 1, 2 , Zhenhai Yu 4 , Desheng Wu 1, 2 , Yuting Shao 1, 2 , Shihang Na 1, 2 , Gang Li 1, 5 , Ruizhen Huang 2, 6 , Tao Xiang 1, 2, 6 , Jianlin Luo 1, 2, 5
National Science Review ( IF 20.6 ) Pub Date : 2019-09-02 , DOI: 10.1093/nsr/nwz129 Wei Wu 1, 2 , Kai Liu 3 , Yanjie Li 1, 2 , Zhenhai Yu 4 , Desheng Wu 1, 2 , Yuting Shao 1, 2 , Shihang Na 1, 2 , Gang Li 1, 5 , Ruizhen Huang 2, 6 , Tao Xiang 1, 2, 6 , Jianlin Luo 1, 2, 5
Affiliation
Exploration of superconductivity in Cr-based compounds has attracted considerable interest because only a few Cr-based superconductors (CrAs, A2Cr3As3 and ACr3As3 (A = K, Rb, Cs, Na)) have been discovered so far and they show an unconventional pairing mechanism. We report the discovery of bulk superconductivity at 5.25 K in chromium nitride in Pr3Cr10-xN11 with a cubic lattice structure. A relatively large upper critical field of Hc2(0) ∼ 12.6 T is determined, which is larger than the estimated Pauli-paramagnetic pair-breaking magnetic field. The material has a large electronic specific-heat coefficient of 170 mJ K−2 mol−1—about 10 times larger than that estimated by the electronic structure calculation, which suggests that correlations between 3d electrons are very strong in Pr3Cr10-xN11, and thus quantum fluctuations might be involved. Electronic structure calculations show that the density of states at the Fermi energy are contributed predominantly by Cr 3d electrons, implying that the superconductivity results mainly from the condensation of Cr 3d electrons. Pr3Cr10-xN11 represents a rare example of possible unconventional superconductivity emerging in a 3D system with strong electron correlations. Nevertheless, clarification of the specific pairing symmetry needs more investigation.
中文翻译:
具有强电子相关性的铬氮化物 Pr3Cr10-xN11 的超导性
Cr 基化合物中超导性的探索引起了相当大的兴趣,因为仅发现了少数 Cr 基超导体(CrAs、A 2 Cr 3 As 3和 ACr 3 As 3 (A = K、Rb、Cs、Na)),因此far 并且它们显示出非常规的配对机制。我们报告了在具有立方晶格结构的Pr 3 Cr 10-x N 11 中的氮化铬中在 5.25 K 下发现体超导性。一个相对较大的H c2上临界场(0) ∼ 12.6 T 被确定,它大于估计的泡利顺磁对断裂磁场。该材料具有 170 mJ K -2 mol -1的大电子比热系数- 比电子结构计算估计的大约 10 倍,这表明 Pr 3 Cr 10-x 中3d 电子之间的相关性非常强N 11,因此可能涉及量子涨落。电子结构计算表明,费米能级的态密度主要由 Cr 3d 电子贡献,这意味着超导性主要来自 Cr 3d 电子的凝聚。Pr 3 Cr 10-x N图 11表示在具有强电子相关性的 3D 系统中可能出现的非常规超导性的罕见示例。然而,具体配对对称性的澄清需要更多的调查。
更新日期:2020-04-17
中文翻译:
具有强电子相关性的铬氮化物 Pr3Cr10-xN11 的超导性
Cr 基化合物中超导性的探索引起了相当大的兴趣,因为仅发现了少数 Cr 基超导体(CrAs、A 2 Cr 3 As 3和 ACr 3 As 3 (A = K、Rb、Cs、Na)),因此far 并且它们显示出非常规的配对机制。我们报告了在具有立方晶格结构的Pr 3 Cr 10-x N 11 中的氮化铬中在 5.25 K 下发现体超导性。一个相对较大的H c2上临界场(0) ∼ 12.6 T 被确定,它大于估计的泡利顺磁对断裂磁场。该材料具有 170 mJ K -2 mol -1的大电子比热系数- 比电子结构计算估计的大约 10 倍,这表明 Pr 3 Cr 10-x 中3d 电子之间的相关性非常强N 11,因此可能涉及量子涨落。电子结构计算表明,费米能级的态密度主要由 Cr 3d 电子贡献,这意味着超导性主要来自 Cr 3d 电子的凝聚。Pr 3 Cr 10-x N图 11表示在具有强电子相关性的 3D 系统中可能出现的非常规超导性的罕见示例。然而,具体配对对称性的澄清需要更多的调查。