Experimental electronic structure of the mineral superconductor covellite CuS

Abstract

Covellite (CuS) is the first known natural mineral superconductor. Despite its simple chemical formula, covellite exhibits a rich crystal structure at the origin of several remarkable properties. The ionic arrangement in CuS crystals leads to a mixed valence of Cu and a second-order structural transition at 55 K. Despite the abundance of structural studies and theoretical reports on its electronic structure, there are scarce references on its experimental band structure. By means of Angle Resolved PhotoEmission Spectroscopy (ARPES), we have probed the experimental electronic structure of covellite. We compare our results with the predictions of density-functional theory (DFT) calculations. Our experimental data are in remarkable agreement with the calculations, revealing subtle fingerprints of the structural phase transition, and confirming the quasi-2D nature of the electronic structure of CuS.

10 pages, 6 figures

References in corpus (11)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Quantum ESPRESSO toward the exascale
• FermiSurfer: Fermi-surface viewer providing multiple representation schemes
• The remarkable underlying ground states of cuprate superconductors
• A precise method for visualizing dispersive features in image plots
• Beyond the quasiparticle approximation: Fully self-consistent $GW$ calculations
• Efficient First-Principles Approach with a Pseudohybrid Density Functional for Extended Hubbard Interactions
• Structural and Electronic Properties of the 2D Superconductor CuS with 1 1/3-valent Copper
• Phase transition and anomalous electronic behavior in layered dichalcogenide CuS (covellite) probed by NQR
• The Valence Transition Model of Pseudogap, Charge-Order and Superconductivity in Electron- and Hole-Doped Copper Oxides