Showing papers by "Guodong Liu published in 2004"
TL;DR: In this article, a theoretical study based on first-principle band-structure calculations is carried out for the hypothetical semi-Heusler alloys NiVM (M=P, As, Sb, S, Se, and Te).
Abstract: A theoretical study based on first-principle band-structure calculations is carried out for the hypothetical semi-Heusler alloys NiVM (M=P, As, Sb, S, Se, and Te). For all compounds it is found that the ferromagnetic state is more favorable than the paramagnetic state. NiVAs is predicted to be a half-metallic ferromagnet with a small half-metallic gap of 0.07 eV and an integer magnetic moment of 2 μB, and NiVP and NiVSb are so-called nearly half-metallic ferromagnets. Furthermore, we find a clear indication that the substitution on the sp atoms influences the hybridization between Ni and V atoms, and can even destroy the half metallicity.
37 citations
TL;DR: In this paper, the first-principle calculation within density-functional theory is used to investigate zinc-blende structured MPo (M=V, Cr, and Mn).
21 citations
TL;DR: In this paper, the preferential orientation of the martensitic variants in NiMnGa single crystals was investigated by optical observation and it was found that the largest strains in the [001] and [010] directions occur in different temperature ranges.
15 citations
TL;DR: In this article, the intrinsic properties of the new ferromagnetic Heusler alloy of Cu2FeAl have been described from magnetic and transport measurements, which can be qualitatively explained by s-d interaction.
Abstract: The new ferromagnetic Heusler alloy of Cu2FeAl has been prepared by melt spinning. The band-structure calculations on this alloy predict a ferromagnetic ground state and the crystal structure not to be stable. The intrinsic properties of Cu2FeAl ribbons are described from magnetic and transport measurements. The electronic structure calculations show that the magnetic moment of Cu2FeAl is not localized, which is not the same as Cu2MnAl. At low temperature, the magnetization decreases as T-3/2, as can be well interpreted by spin-wave theory. An interpretation is given for the electrical resistivity and leads to information about the microscopic scattering mechanisms involved. A negative longitudinal magnetoresistance of less than 1% at high field is observed, which can be qualitatively explained by s-d interaction. The magnetic resistivity is estimated for this compound. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
11 citations