9,654 research outputs found
Crystalline Silicate Feature of the Vega-like star HD145263
We have observed the 8-13 m spectrum (R250) of the Vega-like star
candidate HD145263 using Subaru/COMICS. The spectrum of HD145263 shows the
broad trapezoidal silicate feature with the shoulders at 9.3 m and 11.44
m, indicating the presence of crystalline silicate grains. This detection
implies that crystalline silicate may also be commonly present around Vega-like
stars. The 11.44 m feature is slightly shifted to a longer wavelength
compared to the usual 11.2-3 m crystalline forsterite feature detected
toward Herbig Ae/Be stars and T Tauri stars. Although the peak shift due to the
effects of the grain size can not be ruled out, we suggest that Fe-bearing
crystalline olivine explains the observed peak wavelength fairly well.
Fe-bearing silicates are commonly found in meteorites and most interplanetary
dust particles, which originate from planetesimal-like asteroids. According to
studies of meteorites, Fe-bearing silicate must have been formed in asteroidal
planetesimals, supporting the scenario that dust grains around Vega-like stars
are of planetesimal origin, if the observed 11.44 m peak is due to
Fe-bearing silicates.Comment: accepted for Publication in ApJ
Structural study on Pr0.55(Ca[1-y]Sr[y])0.45MnO3 thin films on perovskite (011) substrate
Structural study on the photo-switching system Pr{0.55}(Ca{1-y}Sr
y){0.45}MnO3 thin films on perovskite (011) substrate has been made with
synchrotron radiation diffraction experiment. The insulating phase of y=0.20
sample was found to be an antiferro-orbital ordered phase with large lattice
distortion and the ferromagnetic metallic phase of y=0.40 film show no distinct
lattice distortion from the paramagnetic phase, which are very similar with
(Nd,Pr)0.5Sr0.5MnO3 films. A striking contrast of the orbital ordered phase of
y=0.20 film to (Nd,Pr)0.5Sr0.5MnO3 films was its untwinned structure.Comment: 8 pages, 4 figures. To be published in European Journal of Physics
Special Topic
In-gap state and effect of light illumination in CuIrS probed by photoemission spectroscopy
We have studied disorder-induced in-gap states and effect of light
illumination in the insulating phase of spinel-type CuIrS using
ultra-violet photoemission spectroscopy (UPS). The Ir/Ir
charge-ordered gap appears below the metal-insulator transition temperature.
However, in the insulating phase, in-gap spectral features with are
observed in UPS just below the Fermi level (), corresponding to the
variable range hopping transport observed in resistivity. The spectral weight
at is not increased by light illumination, indicating that the
Ir-Ir dimer is very robust although the long-range octamer order
would be destructed by the photo-excitation. Present results suggest that the
Ir-Ir bipolaronic hopping and disorder effects are responsible
for the conductivity of CuIrS.Comment: 14 pages, 5 figure
Absence of magnetic ordering in NiGa_2S_4
Triangular-layered NiGa2S4, contrary to intuitive expectation, does not form
a noncollinear antiferromagnetic structure, as do isoelectronic NaCrO2 and
LiCrO2. Instead, the local magnetic moments remain disordered down to the
lowest measured temperature. To get more insight into this phenomenon, we have
performed first principles calculations of the first, second end third
neighbors exchange interactions, and found that the second neighbor exchange is
negligible, while the first and the third neighbor exchanges are comparable and
antiferromagnetic. Both are rapidly suppressed by the on-site Hubbard
repulsion.Comment: 4 pages, 4 figure
Correlation effects in CaCu3Ru4O12
We have investigated the electronic structure of CaCu3Ru4O12 and LaCu3Ru4O12
using soft x-ray photoelectron and absorption spectroscopy together with band
structure and cluster configuration interaction calculations. We found the Cu
to be in a robust divalent ionic state while the Ru is more itinerant in
character and stabilizes the metallic state. Substitution of Ca by La
predominantly affects the Ru states. We observed strong correlation effects in
the Cu 3d states affecting the valence band line shape considerably. Using
resonant photoelectron spectroscopy at the Cu L3 edge we were able to unveil
the position of the Zhang-Rice singlet states in the one-electron removal
spectrum of the Cu with respect to the Ru-derived metallic bands in the
vicinity of the chemical potential
Epitaxial-strain effect on charge/orbital order in Pr0.5Ca0.5MnO3 films
Effect of growth orientation on charge- and orbital-ordering (CO-OO)
phenomena has been studied for Pr0.5Ca0.5MnO3 epitaxial thin films fabricated
on (LaAlO3)0.3-(SrAl0.5Ta0.5O3)0.7 (LSAT) substrates by means of resistivity,
synchrotron x-ray diffraction, and polarized optical microscopy measurements.
CO-OO transition is observed around 220 K for a film grown on an LSAT (011)
substrate ((011)-film), similarly to a bulk sample, while a film grown on a
(001) plane of LSAT ((001)-film) shows much higher transition temperature
around 300 K. The domain size of OO is approximately 3 times as large in the
(011)-film as in the (001)-film. These results demonstrate that various
properties of CO-OO phenomena can be controlled with the growth orientation via
the epitaxial strain from the substrate.Comment: 4 pages, 4 figure
Effect of Pt substitution on the electronic structure of AuTe2
We report a photoemission and x-ray absorption study on Au1-xPtxTe2 (x = 0
and 0.35) triangular lattice in which superconductivity is induced by Pt
substitution for Au. Au 4f and Te 3d core-level spectra of AuTe2 suggests a
valence state of Au2+(Te2)2-, which is consistent with its distorted crystal
structure with Te-Te dimers and compressed AuTe6 otahedra. On the other hand,
valence-band photoemission spectra and pre-edge peaks of Te 3d absorption edge
indicate that Au 5d bands are almost fully occupied and that Te 5p holes govern
the transport properties and the lattice distortion. The two apparently
conflicting pictures can be reconciled by strong Au 5d/Au 6s-Te 5p
hybridization. Absence of a core-level energy shift with Pt substitution is
inconsistent with the simple rigid band picture for hole doping. The Au 4f
core-level spectrum gets slightly narrow with Pt substitution, indicating that
the small Au 5d charge modulation in distorted AuTe2 is partially suppressed.Comment: 13 pages, 4 figures, accepted by Physical Review
- …