Weakly-Correlated Nature of Ferromagnetism in Nonsymmorphic CrO_{2} Revealed by Bulk-Sensitive Soft-X-Ray ARPES

Weakly-Correlated Nature of Ferromagnetism in Nonsymmorphic CrO_{2} Revealed by Bulk-Sensitive Soft-X-Ray ARPES

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Chromium dioxide CrO_{2} belongs to a class of materials called ferromagnetic half-metals, whose peculiar aspect is that they act as a metal in one spin orientation and as a semiconductor or insulator in the opposite one.Despite numerous experimental and theoretical studies motivated by technologically important applications of this material in spintronics, its fundamental properties such as momentum-resolved electron dispersions and the Fermi surface have so far remained experimentally inaccessible because of metastability of its surface, which instantly reduces to amorphous Cr_{2}O_{3}.In this work, we demonstrate that direct access to the native electronic structure of CrO_{2} can be achieved with soft-x-ray angle-resolved photoemission spectroscopy whose tokidoki hello kitty blind box large probing depth penetrates through the Cr_{2}O_{3} layer.For the first time, the electronic dispersions and Fermi surface of CrO_{2} are measured, which are fundamental prerequisites to solve the long debate on the nature of electronic correlations in this material.Since density functional theory augmented by a relatively weak local Coulomb repulsion gives an exhaustive description of our spectroscopic data, we rule out strong-coupling theories of CrO_{2}.

Crucial for the correct interpretation of our experimental data in terms of the valence-band dispersions is the understanding of a nontrivial spectral response of CrO_{2} caused by hindirochakkahaniya.com interference effects in the photoemission process originating from the nonsymmorphic space group of the rutile crystal structure of CrO_{2}.