Angle Resolved Photoemission Measurements of Metastable Single Crystals of Tetragonal CoSe

Using topochemical deintercalation methods, single crystals of the tetragonal phase of Cobalt Selenide, isostructural to the iron based superconductor FeSe, have recently been synthesized^1,2. Here, we present synchrotron angle resolved photoemission (ARPES) measurements of these metastable crystals and compare to recent ARPES measurements of MBE synthesized thin films³ as well as density functional theory calculations⁴. We discuss similarities and differences between bulk tetragonal CoSe and FeSe in terms of correlation and renormalization effects on the band structure and the effects of dimensionality.

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[2] Wilfong et al. Phys. Rev. B 2018, 97
[3] Shen et al. Phys. Rev. Materials 2018, 2
[4] Yang et al. Solid State Comm. 2019, 300