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Half-Metallic Ferromagnetism and the spin polarization in CrO₂

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arxiv cond-mat/0609060 v3 pith:NHXZNWGJ submitted 2006-09-04 cond-mat.str-el cond-mat.mtrl-sci

Half-Metallic Ferromagnetism and the spin polarization in CrO₂

classification cond-mat.str-el cond-mat.mtrl-sci
keywords half-metalliccalculationscombinationspinstatesallowedalmostapproach
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present electronic structure calculations in combination with local and non-local many-body correlation effects for the half-metallic ferromagnet CrO$_2$. 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 CrO$_2$ as seen in superconducting point contact spectroscopy. The combination of these two techniques allowed us to qualitatively describe the spin-polarization in CrO$_2$.

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