Unconventional high temperature superconductivity in cubic zinc-blende transition metal compounds
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July 2020 Vol. 63 No. 7: 277411 https://doi.org/10.1007/s11433-019-1495-3
Unconventional high temperature superconductivity in cubic zinc-blende transition metal compounds Qiang Zhang1, Kun Jiang1,2, YuHao Gu1,3, and JiangPing Hu1,4* 1 Beijing
National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; 2 Department of Physics, Boston College, Chestnut Hill, MA 02467, USA; 3 Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China; 4 Kavli Institute of Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China Received November 4, 2019; accepted December 11, 2019; published online March 30, 2020
We consider possible high temperature superconductivity (high-T c ) in transition metal compounds with a cubic zinc-blende lattice structure. When the electron filling configuration in the d-shell is close to d7 , all three t2g orbitals are near half filling with strong nearest neighbor antiferromagnetic (AFM) superexchange interactions. We argue that upon doping, this electronic environment can be one of “genes” to host unconventional high T c with a time reversal symmetry broken d2z2 −x2 −y2 ± id x2 −y2 pairing symmetry. With gapless nodal points along the diagonal directions, this state is a direct three-dimensional analogue to the two-dimensional B1g d-wave state in cuprates. We suggest that such a case may be realized in electron doped CoN, such as CoN1−x O x and (H, Li)1−x CoN. high temperature superconductivity, zinc-blende structure, three-dimensional d+id wave PACS number(s): Citation:
74.10.+v, 74.20.Mn, 74.20.Rp, 71.10.Li
Q. Zhang, K. Jiang, Y. H. Gu, and J. P. Hu, Unconventional high temperature superconductivity in cubic zinc-blende transition metal compounds, Sci. China-Phys. Mech. Astron. 63, 277411 (2020), https://doi.org/10.1007/s11433-019-1495-3
1 Introduction The superconducting mechanism of unconventional highT c in cuprates and iron-based superconductors [1] remains one of the most challenging problems in condensed matter physics [2]. A correct answer to this problem should be able to guide us to predict new materials with potential high-T c . Recently, we have identified that a key character, called the electronic gene, which separates these two classes of highT c materials from other transitional metal compounds, is that the d-orbitals with the strongest in-plane d-p couplings in both high-T c families are isolated near Fermi energy [3]. The *Corresponding author (email: [email protected])
gene can only be realized by a specific collaboration through cation-anion complexes, global lattice structures, and specific electron filling configurations in the d-shell of transition metal atoms. In cuprates, the d x2 −y2 eg orbital is isolated near Fermi energy in a two-dimensiona
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