Unconventional high temperature superconductivity in cubic zinc-blende transition metal compounds

Abstract

We consider possible high temperature superconductivity (high-Tc) in transition metal compounds with a cubic zinc-blende lattice structure. When the electron filling configuration in the d-shell is close to d 7 , 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 Tc with a time reversal symmetry broken d 2z 2 −x 2 −y 2 ± id x 2 −y 2 pairing symmetry. With gappless nodal points along the diagonal directions, this state is a direct three dimensional analogue to the two dimensional B1g dwave state in cuprates. We suggest that such a case may be realized in electron doped CoN, such as CoN1−xOx and (H, Li)1−xCoN. arXiv:1910.10904v1 [cond-mat.supr-con]

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“…The discoveries of superconductivity (SC) in the complex copper oxide [1] and the iron-based pnictide [2] stimulate enthusiasm to search for SC especially in late 3d-transition-metal (Fe, Co, Ni, and Cu) compounds [3][4][5][6][7]. Among them, the Co-based superconductors are very limited so far.…”

Study of carbon doped cobalt mononitride thin films

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