We present a scenario for iron-pnictide superconductivity mediated by charge fluctuations that are strongly enhanced by Fe-As intersite electronic interactions. Deriving an eight-band extended Hubbard model including Fe 3d and As 4p orbitals for the LaOFeAs family, we show that charge fluctuations induced byp-d charge transfer and As orbital polarization interactions in the Fe-pnictogen structu...

Electronic and magnetic structures of the Ce/Fe(110) system were studied by means of spinand angle-resolved resonant photoemission. Antiferromagnetic coupling of Fe 3d and Ce 4f spin magnetic moments was concluded from spin-resolved photoemission measurements supported by the electronic structure calculations. The relative intensity of the minority-spin component of hybridization feature at the...

The rate coefficient for dielectronic recombination (DR) of Ne-like Fe forming Na-like Fe was measured employing the merged electron-ion beams technique at the heavyion storage-ring TSR of the Max-Planck-Institut für Kernphysik in Heidelberg, Germany. In the electron-ion collision energy range of 240–840 eV the merged-beams recombination rate coefficient is dominated by DR associated with 2s 2p...

In order to study the interstitial atoms in the NiAs-type structure MnSb the spin density distribution in MnFeg^gSB was investigated. The magnetic moment Fe Cu(Fe) = 1.0 ± 0.2 p^/atom) is polarized antiparallel to the magnetisation of the Mn-matrix. The unpaired electron configuration of Mn is the same as in Mnj QySb which indicates that the smaller, c-lattice parameter is due to a hybridisatio...

Recently, an unusual intermixing-driven scenario for the growth of atomic Pd chains on a Pd(110) surface during deposition of 3d metal atoms has been predicted (Stepanyuk 2009 Phys. Rev. B 79 155410) and confirmed by STM and STS experiments (Wie et al 2009 Phys. Rev. Lett. 103 225504). Performing ab initio calculations we demonstrate that Pd atomic chains grown above embedded Fe atoms exhibit m...

This work shows results of dynamic lumpedelement (LE) thermal modeling of power AlGaN/GaN HEMTs. A realistic 3D structure including top-side metals, GaN-Si thermal boundary resistance, die-attach, and source via hole is modeled using a finite-element (FE) tool, and the results are used to develop simplified LE dynamic thermal models. We show that the LE models can match the FE data with excelle...

The syntheses, structures, and magnetic properties of compounds of formula [Fe(III)(5-Clsal(2)-trien)][Mn(II)Cr(III)(ox)(3)]·0.5(CH(3)NO(2)) (1), [Fe(III)(5-Brsal(2)-trien)][Mn(II)Cr(III)(ox)(3)] (2), and [In(III)(5-Clsal(2)-trien)][Mn(II)Cr(III)(ox)(3)] (3) are reported. The structure of the three compounds, which crystallize in the orthorhombic P2(1)2(1)2(1) chiral space group, presents a 3D ...