3,034 research outputs found
Near-ultraviolet inverse photoemission spectroscopy using ultra-low energy electrons
In previous inverse photoemission spectroscopy (IPES) experiments, either X-ray (hv > 1 keV) or vacuum ultraviolet (hv ≈ 10 eV) photons were detected following the injection of electrons with energies of 10 - 1000 eV into solid materials. Here, we demonstrate IPES in the near-ultraviolet range (hv < 5 eV) using electrons with kinetic energies less than 4 eV. The energy resolution of the instrument is attained to be 0.27 eV. From the spectra of copper phthalocyanine films, it is found that damage to the organic sample is significantly reduced, demonstrating that this method is especially suitable for organic semiconducting materials
Cohomology and L-values
In a paper published in 1959, Shimura presented an elegant calculation of the
critical values of L-functions attached to elliptic modular forms using the
first cohomology group. We will show that a similar calculation is possible for
Hilbert modular forms over real quadratic fields using the second cohomology
group. We present explicit numerical examples calculated by this method
Development of Two-Phase Flow Correlation for Fluid Mixing Phenomena in Boiling Water Reactor
Magnetization Plateaus in the Spin-1/2 Kagome Antiferromagnets: Volborthite and Vesignieite
The magnetization of two spin-1/2 kagome antiferromagnets, volborthite and
vesignieite, has been measured in pulsed magnetic fields up to 68 T. A
magnetization plateau is observed for each compound near the highest magnetic
field. Magnetizations at saturation are approximately equal to 0.40Ms for both
compounds, where Ms is the fully saturated magnetization, irrespective of a
difference in the distortion of the kagome lattice between the two compounds.
It should be noted that these values of magnetizations are significantly larger
than Ms/3 predicted theoretically for the one-third magnetization plateau in
the spin-1/2 kagome antiferromagnet. The excess magnetization over Ms/3 is
nearly equal to the sum of the magnetizations gained at the second and third
magnetization steps in volborthite, suggesting that there is a common origin
for the excess magnetization and the magnetization steps.Comment: 4 pages, 4 figures. Phys. Rev. B, accepte
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