CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Cobalt-Dimer Nitrides: A Potential Novel Family of High-Temperature Superconductors |
Yuhao Gu1, Kun Jiang1,2, Xianxin Wu3, and Jiangping Hu1,4* |
1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China 3Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China 4Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
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Cite this article: |
Yuhao Gu, Kun Jiang, Xianxin Wu et al 2022 Chin. Phys. Lett. 39 097401 |
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Abstract We predict that the square lattice layer formed by [Co$_2$N$_2$]$^{2-}$ diamond-like units can host high-temperature superconductivity. The layer appears in the stable ternary cobalt nitride, BaCo$_2$N$_2$. The electronic physics of the material stems from Co$_2$N$_2$ layers where the dimerized Co pairs form a square lattice. The low energy physics near Fermi energy can be described by an effective two-orbital model. Without considering interlayer couplings, the two orbitals are effectively decoupled. This electronic structure satisfies the “gene” character proposed for unconventional high-temperature superconductors. We predict that the leading superconducting pairing instability is driven from an extended $s$-wave ($s^\pm$) to a $d$-wave by hole doping, e.g., in Ba$_{1-x}$K$_x$Co$_2$N$_2$. This study provides a new platform to establish the superconducting mechanism of unconventional high-temperature superconductivity.
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Received: 27 July 2022
Express Letter
Published: 31 August 2022
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PACS: |
74.20.-z
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(Theories and models of superconducting state)
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74.70.-b
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(Superconducting materials other than cuprates)
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74.20.Pq
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(Electronic structure calculations)
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[1] | Hu J, Le C, and Wu X 2015 Phys. Rev. X 5 041012 |
[2] | Hu J 2016 Sci. Bull. 61 561 |
[3] | Bednorz J G and Müller K A 1986 Z. Phys. B 64 189 |
[4] | Kamihara Y, Watanabe T, Hirano M, and Hosono H 2008 J. Am. Chem. Soc. 130 3296 |
[5] | Hu J and Le C 2017 Sci. Bull. 62 212 |
[6] | Le C, Qin S, and Hu J 2017 Sci. Bull. 62 563 |
[7] | Hu J, Gu Y, and Le C 2018 Sci. Bull. 63 1338 |
[8] | Poltavets V V, Greenblatt M, Fecher G H, and Felser C 2009 Phys. Rev. Lett. 102 046405 |
[9] | Seo K J, Bernevig B A, and Hu J P 2008 Phys. Rev. Lett. 101 206404 |
[10] | Hirschfeld P J, Korshunov M M, and Mazin I I 2011 Rep. Prog. Phys. 74 124508 |
[11] | Damascelli A, Hussain Z, and Shen Z X 2003 Rev. Mod. Phys. 75 473 |
[12] | Kresse G and Furthmüller J 1996 Phys. Rev. B 54 11169 |
[13] | Kresse G and Joubert D 1999 Phys. Rev. B 59 1758 |
[14] | Perdew J P, Burke K, and Ernzerhof M 1996 Phys. Rev. Lett. 77 3865 |
[15] | Mostofi A A, Yates J R, Lee Y S, Souza I, Vanderbilt D, and Marzari N 2008 Comput. Phys. Commun. 178 685 |
[16] | Marzari N, Mostofi A A, Yates J R, Souza I, and Vanderbilt D 2012 Rev. Mod. Phys. 84 1419 |
[17] | Jiang K, Hu J, Ding H, and Wang Z 2016 Phys. Rev. B 93 115138 |
[18] | Gu Y, Wu X, Jiang K, and Hu J 2021 Chin. Phys. Lett. 38 017501 |
[19] | Liechtenstein A, Anisimov V I, and Zaanen J 1995 Phys. Rev. B 52 R5467 |
[20] | Ma F, Ji W, Hu J, Lu Z Y, and Xiang T 2009 Phys. Rev. Lett. 102 177003 |
[21] | Zeng J, Qing S, Le C, and Hu J 2017 Phys. Rev. B 96 174506 |
[22] | Castellani C, Natoli C R, and Ranninger J 1978 Phys. Rev. B 18 4945 |
[23] | Georges A, de Medici L, and Mravlje J 2013 Annu. Rev. Condens. Matter Phys. 4 137 |
[24] | Kugel K I and Khomskii D I 1973 Sov. Phys.-JETP 37 725 |
[25] | Kugel K I and Khomskii D I 1982 Sov. Phys. Usp. 25 231 |
[26] | Bunemann J, Weber W, and Gebhard F 1998 Phys. Rev. B 57 6896 |
[27] | Lechermann F, Georges A, Kotliar G, and Parcollet O 2007 Phys. Rev. B 76 155102 |
[28] | Zhou S and Wang Z 2010 Phys. Rev. Lett. 105 096401 |
[29] | Zhou S, Gao M, Ding H, Lee P A, and Wang Z 2005 Phys. Rev. Lett. 94 206401 |
[30] | Jiang K, Wu X, Hu J, and Wang Z 2018 Phys. Rev. Lett. 121 227002 |
[31] | Ren Y, Xu J H, and Ting C S 1996 Phys. Rev. B 53 2249 |
[32] | Matsumoto M and Shiba H 1996 J. Phys. Soc. Jpn. 65 2194 |
[33] | Li Q P, Koltenbah B E C, and Joynt R 1993 Phys. Rev. B 48 437 |
[34] | Jain A, Ong S P, Hautier G, Chen W, Richards W D, Dacek S, Cholia S, Gunter D, Skinner D, Ceder G, and Persson K A 2013 APL Mater. 1 011002 |
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