Electron correlation effects and magnetic ordering at the Gd(0001) surface

Article

关键词: GD;    BULK;    TEMPERATURE;    RECONSTRUCTION;    METAL;   

DOI  :  10.1103/PhysRevB.61.R9213

来源: SCIE

【 摘 要 】

Effects of electron correlation on the electronic structure and magnetic properties of the Gd(0001) surface are investigated using the full-potential linearized. augmented plane-wave implementation of correlated band theory (LDA+U). The use of LDA+U instead of LDA (local-density approximation) total-energy calculations produces the correct ferromagnetic ground state for both bulk Gd and the Gd surface. Surface strain relaxation leads to a 90% enhancement of the interlayer surface-to-bulk effective exchange coupling. Application of a Landau-Ginzburg-type theory yields a 30% enhancement of the Curie temperature at the surface, in very good agreement with the experiment.

【 授权许可】

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