Spin-orbital coupling: The study of orbital degeneracy in transition metal oxides is motivated, e.g., by the large variety of spin-charge-orbital ordered phases, the possible control of the orbital degree of freedom at interfaces and heterostructures, the switching from orbital ordered to metallic phases in applied magnetic fields, and the colossal magnetoresistance. The rather complex interpla...

A combination of dynamical mean field theory and density functional theory, as implemented by Haule et al. [Phys. Rev. B 81, 195107 (2010)], is applied to both the early and late transition metal oxides. For a fixed value of the local Coulomb repulsion, without fine tuning, we obtain the main features of these series, such as the metallic character of SrVO3 and the insulating gaps of LaVO3, LaT...

Many components and devices in electronic systems are fabricated from materials that have a preferred crystallographic orientation or texture. The applications in which the texture of the material plays a key role in determining the properties and performance are broad: Al and Cu interconnects in integrated circuits, complex oxides in random access memory devices, and metallic alloys in magneti...

The paper studies the polishing power of a tribochemically active abrasive material based on solid solution iron and aluminum oxides, as well oxides modified by zirconium oxide yttrium additives, tribotechnical properties lubricant doped with these materials. Al2O3·Fe2O3·ZrO2·Y2O3 powders prove to have an essentially higher producing considerably lower surface roughness than that unmodified Al2...

Magnetoresistance (MR) is the magnetic field-induced change of electrical resistance. The MR effect not only has wide applications in hard drivers and sensors but also is a long-standing scientific issue for complex interactions. Ferromagnetic/ferrimagnetic oxides generally show negative MR due to the magnetic field-induced spin order. We report the unusually giant positive MR up to 17,200% (at...

Using complementary experiments we show that the room temperature ferromagnetism observed in anatase Co:TiO(2) films is not carrier mediated, but coexists with the dielectric state. TEM and x-ray absorption spectroscopy reveal a solid solution of Co in anatase, where Co is not metallic but in the +2 state substituting for Ti. Measurements at 300 K yield a M(S) of 1.1 mu(B)/Co atom, while all fi...

Aiming to understand the role of the substrate in the adsorption of oxygen and carbon monoxide on small gold clusters supported on metallic oxides, we have started a systematic study of these processes on different substrates. Here we present results concerning adsorption on gold clusters in the gas phase, as well as supported on two different Al2O3 substrates: a fully relaxed stoichiometric cl...

Carbon deposition due to the inverse Boudouard reaction (2CO → CO2 + C) has been studied on yttria-stabilized zirconia (YSZ), Y2O3, and ZrO2 in comparison to CH4 by a variety of different chemical, structural, and spectroscopic characterization techniques, including electrochemical impedance spectroscopy (EIS), Fourier-transform infrared (FT-IR) spectroscopy and imaging, Raman spectroscopy, and...

Functional 1D metal oxides have attracted much attention because of their unique applications in electronic, optoelectronic, and spintronic devices. For semiconducting oxide nanowires (NWs) (e.g., ZnO, In2O3, and SnO2 NWs), field-effect transistors and light-emitting diodes have been demonstrated. Metallic oxide nanoscale materials, such as nanoscale RuO2, can be good candidates as interconnect...

Abstract In this paper, we review recent research developments regarding the tribological performances of a series inorganic nano-additives in lubricating fluids. First, examine several basic types nanomaterials, including metallic nanoparticles, metal oxides, carbon and “other” nanomaterials. More specifically, nanoparticles include silver, copper, nickel, molybdenum, tungsten nanoparticles; o...