A. M. Balbashov

Dielectric functions and optical bandgaps of high-K dielectrics for metal-oxide-semiconductor field-effect transistors by far ultraviolet spectroscopic ellipsometry

A far ultraviolet (UV) spectroscopic ellipsometer system working up to 9 eV has been developed, and applied to characterize high-K-dielectric materials. These materials have been gaining greater attention as possible substitutes for SiO2 as gate dielectrics in aggressively scaled silicon devices. The optical properties of four representative high-K bulk crystalline dielectrics, LaAlO3, Y2O3-stabilized HfO2 (Y2O3)0.15–(HfO2)0.85, GdScO3, and SmScO3, were investigated with far UV spectroscopic ellipsometry and visible-near UV optical transmission measurements. Optical dielectric functions and optical band gap energies for these materials are obtained from these studies. The spectroscopic data have been interpreted in terms of a universal electronic structure energy scheme developed form ab initio quantum chemical calculations. The spectroscopic data and results provide information that is needed to select viable alternative dielectric candidate materials with adequate band gaps, and conduction and valence b...

Observation of a griffiths phase in paramagnetic La1-xSrxMnO3.

We report on the discovery of a novel triangular phase regime in the system La1-xSrxMnO3 by means of electron spin resonance and magnetic susceptibility measurements. This phase is characterized by the coexistence of ferromagnetic entities within the globally paramagnetic phase far above the magnetic ordering temperature. The nature of this phase can be understood in terms of Griffiths singularities arising due to the presence of correlated quenched disorder in the orthorhombic phase.

Structural, magnetic, and electrical properties of single-crystalline La 1 − x Sr x MnO 3 ( 0.4 x 0.85 )

We report on structural, magnetic, and electrical properties of Sr-doped

Multiferroic phases of Eui_xYxMnO3

{\mathrm{LaMnO}}_{3}

Charge carrier localization in investigated by ac conductivity measurements

single crystals for doping levels

Spin-controlled Mott-Hubbard bands in LaMnO3 probed by optical ellipsometry

0.4l~xl~0.85.

Al substituted Ba-hexaferrite single-crystal films for millimeter-wave devices

The complex structural and magnetic phase diagram can only be explained assuming significant contributions from the orbital degrees of freedom. Close to

Magnetic properties and specific heat of R MnO 3 ( R = Pr , Nd)

x=0.6

Relaxations as Key to the Magnetocapacitive Effects in the Perovskite Manganites

a ferromagnetic metal is followed by an antiferromagnetic metallic phase below 200 K. This antiferromagnetic metallic phase exists in a monoclinic crystallographic structure. Following theoretical predictions this metallic antiferromagnet is expected to reveal an

Submillimeter backward-wave oscillator spectroscopy of the rare-earth orthoferrites

{(x}^{2}\ensuremath{-}{y}^{2})