Host-dependent electronic structure of vanadium impurities in different alkali metals
نویسندگان
چکیده
The magnetic moment of V impurities in different alkali hosts is measured by means of the anomalous Hall effect. The V moment on the surface and in the bulk of Cs is about 4mB and considerably smaller than previously measured moments of V on the surface (7mB) and in the bulk (6.6mB) of Na. Furthermore the sign of the anomalous Hall resistance changes from negative for the Na host to positive for the Cs host. This indicates a change of the electronic structure of the impurity ~plus host environment! when going from Na to Cs hosts.
منابع مشابه
Strongly enhanced magnetic moments of vanadium impurities in thin films of sodium and potassium.
Thin quench-condensed films of Na and K are covered with 1/100 of a monolayer of V. Then the impurities are covered with several atomic layers of the host. The magnetization of the films is measured by means of the anomalous Hall effect. For V impurities on the surface of Na and K, a magnetic moment of 7 Bohr magnetons is observed. After coverage with the host, the V moment became 6.5 mu(B) for...
متن کاملTemperature-Dependent Dispersion Coefficients of Alkali Metals Using Equation of State
In this study, a temperature-dependent of the dispersion coefficients is calculated from equation state.The Lennard-Jones LJ (12-6-3) effective pair potential function and simple thermodynamic argumentwith the input PVT data of liquid metals are used to calculate the dispersion coefficients. The dispersioncoefficients ( , , ) 3 6 12 C C C are found to be a linear function of 1/T1+α , where T is...
متن کاملCorrelated electrons step by step: itinerant-to-localized transition of fe impurities in free-electron metal hosts.
High-resolution photoemission spectroscopy and ab initio calculations have been employed to analyze the onset and progression of d-sp hybridization in Fe impurities deposited on alkali metal films. The interplay between delocalization, mediated by the free-electron environment, and Coulomb interaction among d electrons gives rise to complex electronic configurations. The multiplet structure of ...
متن کاملAlkali Metal Ion-Modified Vanadium Mononuclear Complex for Photocatalytic Mineralization of Organic Compounds
Modification of silica-supported vanadium oxide (VS) photocatalysts with alkali metal ions enhanced the photocatalytic activity of the vanadium(V) mononuclear complex for oxidative decomposition of gaseous organic compounds into carbon dioxide. Action spectrum analysis revealed that the onset wavelength for cesium-ion-modified VS was 420 nm, which was ca. 20 nm longer than that with a titania p...
متن کاملProximity-induced magnetism in transition-metal substituted graphene
We investigate the interactions between two identical magnetic impurities substituted into a graphene superlattice. Using a first-principles approach, we calculate the electronic and magnetic properties for transition-metal substituted graphene systems with varying spatial separation. These calculations are compared for three different magnetic impurities, manganese, chromium, and vanadium. We ...
متن کامل