Half-Metallic Ferromagnetism and the spin polarization in CrO2
L. Chioncel, H. Allmaier, E. Arrigoni, A. Yamasaki, M. Daghofer, M. I. Katsnelson, A. I. Lichtenstein
Abstract
We present electronic structure calculations in combination with local and non-local many-body correlation effects for the half-metallic ferromagnet CrO2. Finite-temperature Dynamical Mean Field Theory results show the existence of non-quasiparticle states, which were recently observed as almost currentless minority spin states near the Fermi energy in resonant scattering experients. At zero temperatures, Variational Cluster Approach calculations support the half-metallic nature of CrO2 as seen in superconducting point contact spectroscopy. The combination of these two techniques allowed us to qualitatively describe the spin-polarization in CrO2.
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