A. Yamasaki

Prominent quasiparticle peak in the photoemission spectrum of the metallic phase of V2O3.

We present the first observation of a prominent quasiparticle peak in the photoemission spectrum of the metallic phase of V2O3 and report new spectral calculations that combine the local-density approximation with the dynamical mean-field theory (using quantum Monte Carlo simulations) to show the development of such a distinct peak with decreasing temperature. The experimental peak width and weight are significantly larger than in the theory.

Direct k-space mapping of the electronic structure in an oxide-oxide interface.

The interface between LaAlO(3) and SrTiO(3) hosts a two-dimensional electron system of itinerant carriers, although both oxides are band insulators. Interface ferromagnetism coexisting with superconductivity has been found and attributed to local moments. Experimentally, it has been established that Ti 3d electrons are confined to the interface. Using soft x-ray angle-resolved resonant photoelectron spectroscopy we have directly mapped the interface states in k space. Our data demonstrate a charge dichotomy. A mobile fraction contributes to Fermi surface sheets, whereas a localized portion at higher binding energies is tentatively attributed to electrons trapped by O vacancies in the SrTiO(3). While photovoltage effects in the polar LaAlO(3) layers cannot be excluded, the apparent absence of surface-related Fermi surface sheets could also be fully reconciled in a recently proposed electronic reconstruction picture where the built-in potential in the LaAlO(3) is compensated by surface O vacancies serving also as a charge reservoir.

Kondo Lattice Effects of YbAl3 Suggested by Temperature Dependence of High-Accuracy High-Energy Photoelectron Spectroscopy

By use of high-resolution soft X-rays, intrinsic temperature dependences of bulk Yb 4f photoelectron spectra were obtained for fractured surfaces of high-purity YbAl 3 single crystals. The spectra ...

Technique for bulk Fermiology by photoemission applied to layered ruthenates

We report the Fermi surfaces of the superconductor

Perpendicular magnetization of L10-ordered FePt films in the thinnest limit

{\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}

A simplified method to generate serotonergic neurons from mouse embryonic stem and induced pluripotent stem cells

and the nonsuperconductor

~8?keV photoemission of the metal?insulator transition system VO2

{\mathrm{Sr}}_{1.8}{\mathrm{Ca}}_{0.2}{\mathrm{RuO}}_{4}

Electron correlation in the FeSe superconductor studied by bulk-sensitive photoemission spectroscopy

probed by bulk-sensitive high-energy angle-resolved photoemission. It is found that there is one square-shaped hole-like, one square-shaped electron-like, and one circle-shaped electron-like Fermi surface in both compounds. These results provide direct evidence for nesting instability giving rise to magnetic fluctuations. Our study clarifies that the electron correlation effects are changed with composition depending on the individual band.

Photoemission study of ( V 1 − x M x ) 2 O 3 ( M = Cr , Ti )

L10-ordered FePt ultrathin films with thickness down to subnanometer range were fabricated by alternate monatomic layer (ML) deposition of Fe and Pt on Pt (001) substrate and were capped by Pt. Perpendicular Fe magnetic moment under magnetic field, together with that under remanence, was detected by soft x-ray magnetic circular dichroism. Pt∕(Fe1ML∕Pt1ML)3∕Pt (001), whose FePt layer is ∼1nm thick, showed perpendicular remanent magnetization at room temperature. At low temperatures, perpendicular remanent magnetization was found even at the thinnest end, i.e., 1 ML Fe sandwiched by Pt (001).

Charge dynamics in strongly correlated one-dimensional Cu-O chain systems revealed by inelastic x-ray scattering

J. Neurochem. (2012) 122, 81–93.