The electronic properties of unsupported and supported NiO films on Ag(100) have been studied theoretically using two methods. Results from density functional theory using the GGA+U approach and plane wave basis sets have been compared with those obtained with a hybrid functional and an atomic orbital basis set. In general the two approaches provide similar answers, with the exception of the NiO band gap which is better reproduced in the hybrid DFT approach. Both unsupported and supported films have an antiferromagnetic ordering, and only the magnetization of the Ni ions at direct contact with the metal substrate is slightly reduced, the rest being basically unperturbed. At variance with MgO/Ag(100) interfaces, NiO films adhere to Ag(100) with a bonding which includes also important covalent contributions. This results in a much smaller work function change than in MgO/Ag(100) and in tails of the NiO states which contribute to the density of states at the Fermi level.

Cinquini, F., Giordano, L., Pacchioni, G., Ferrari, A., Pisani, C., Roetti, C. (2006). Electronic structure of NiO Ag (100) thin films from DFT+U and hybrid functional DFT approaches. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 74(16), 165403-165410 [10.1103/PhysRevB.74.165403].

Electronic structure of NiO Ag (100) thin films from DFT+U and hybrid functional DFT approaches

CINQUINI, FABRIZIO;GIORDANO, LIVIA;PACCHIONI, GIANFRANCO;
2006

Abstract

The electronic properties of unsupported and supported NiO films on Ag(100) have been studied theoretically using two methods. Results from density functional theory using the GGA+U approach and plane wave basis sets have been compared with those obtained with a hybrid functional and an atomic orbital basis set. In general the two approaches provide similar answers, with the exception of the NiO band gap which is better reproduced in the hybrid DFT approach. Both unsupported and supported films have an antiferromagnetic ordering, and only the magnetization of the Ni ions at direct contact with the metal substrate is slightly reduced, the rest being basically unperturbed. At variance with MgO/Ag(100) interfaces, NiO films adhere to Ag(100) with a bonding which includes also important covalent contributions. This results in a much smaller work function change than in MgO/Ag(100) and in tails of the NiO states which contribute to the density of states at the Fermi level.
Articolo in rivista - Articolo scientifico
oxide surfaces, DFT
English
2006
74
16
165403
165410
165403
none
Cinquini, F., Giordano, L., Pacchioni, G., Ferrari, A., Pisani, C., Roetti, C. (2006). Electronic structure of NiO Ag (100) thin films from DFT+U and hybrid functional DFT approaches. PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS, 74(16), 165403-165410 [10.1103/PhysRevB.74.165403].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/45274
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