We show that a class of compounds with $I$4/$mcm$ crystalline symmetry hosts three-dimensional semi-Dirac fermions. Unlike the known two-dimensional points, degeneracy these points is not lifted by spin-orbit coupling due to protection nonsymmorphic -- screw rotation in $a-b$ plane and translation along $c$ axis. This found tetragonal perovskite oxides, realizable thin films epitaxial strain re...

group viii b metal oxides supported on gamma-alumina were investigated as catalysts and promoters of moo3 hydrodesulfurization catalysis. superior promotion was observed in pbo promoted catalyst compared to that of coo, the typically accepted promoter. other metal oxides, sno and ho2o3 exhibited reasonable hydrodesulfurization catalysis promotion but lower than for coo promoted catalyst.

The local electronic environments and energy storage properties of lithium electrodes are investigated through inelastic electron scattering and electrochemical measurements. Experimental and computational methods are developed to characterize the electronic structure of lithiated compounds during electrochemical cycling. An electrochemical investigation of new lithium alloys has led to a bette...

In contrast to the irreversible transition of resistive switching induced by oxygen-vacancy filaments (VF) and metal filaments (MF) reported in the literature, this study reports coexistence and completely reversible transition of VF-and MF-induced resistive switching in a Ni/HfO 2 /SiO x /p +-Si device with three distinct and stable resistance states. In a dual filament model proposed, VF and ...

Many metal-insulator-metal systems show electrically induced resistive switching effects and have therefore been proposed as the basis for future non-volatile memories. They combine the advantages of Flash and DRAM (dynamic random access memories) while avoiding their drawbacks, and they might be highly scalable. Here we propose a coarse-grained classification into primarily thermal, electrical...

Magnetic properties (coercivity and magnetization) of ferromagnetic films are strongly affected by the proximity to materials that undergo a metal to insulator transition. Here, we show that stress associated with structural changes across the metal-insulator phase transition in VO2 and V2O3 produces a magnetoelastic anisotropy in ferromagnetic films (Co and Ni) deposited on top of the oxides. ...

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...

The metal-insulator transition is characterized as a single peak in the temperature-dependent resistivity measurements; exceptions to this have never been seen in any single crystal material system. We show that by reducing a single crystal manganite thin film to a wire with a width comparable to the mesoscopic phase-separated domains inherent in the material, a second and robust metal-insulato...

be optimized. [ 7–12 ] In general, very little design guidelines are available to preselect high-capacity electrode materials, and the search for novel cathodes has been largely by trial and error. Here, we show that there is a welldefi ned relation between the composition, transition-metal ordering, and the diffusion kinetics of lithium intercalation. Mapping the confi gurational space of orde...