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- W2051209626 abstract "We have studied the interaction of various isomers of Co4 and Ni4 clusters with the regular (0 0 1) surface of MgO. First principles gradient-corrected density functional calculations have been performed on cluster models embedded in point charges to represent the oxide surface. The magnetic and geometric structure of the free and supported clusters have been studied to identify the modifications induced by the interaction with the substrate. Gas-phase Co4 is a non-planar square very close in energy to rhombic or distorted rhombic structures. On MgO the most stable isomer is a tetrahedron but the rhombus is only slightly higher in energy. Adsorbed Ni4 assumes tetrahedral or distorted tetrahedral shapes similar to the gas-phase structure. Only a partial magnetic quenching is observed, restricted to the metal atoms in direct contact with the surface. Ni forms stronger bonds than Co with the oxide surface so that distorted structures compete in energy with the undistorted ones. The results show that despite the relatively strong bond between the cluster and MgO (2.0 eV for Co4 and 2.4 eV for Ni4) the perturbation induced on the cluster electronic structure is small." @default.
- W2051209626 created "2016-06-24" @default.
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- W2051209626 date "2001-02-01" @default.
- W2051209626 modified "2023-10-18" @default.
- W2051209626 title "Electronic structure and magnetic moments of Co4 and Ni4 clusters supported on the MgO(001) surface" @default.
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- W2051209626 doi "https://doi.org/10.1016/s0039-6028(00)00974-2" @default.
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