90 research outputs found
Measurements of the band gap of ThF4 by electron spectroscopy techniques
We present an experimental determination of the band gap of ThF4 performed by two different techniques.
The first measurement was performed by combining x-ray photoemission spectroscopy and bremsstrahlung
isochromat spectroscopy. The second measurement exploited the position of the inelastic threshold in reflection
electron energy loss spectroscopy. Both measurements gave compatible values of the band gap, with the average
E = 10.2(2) eV. This value was found to be in excellent agreement with theoretical calculations. The measured
band gap is significantly larger than the 229mTh excitation energy, making ThF4 a possible candidate material for
a solid-state nuclear clock based on the vacuum ultraviolet \u3b3 decay
Magnetic and electrical properties of (Pu,Lu)Pd3
We present measurements of the magnetic susceptibility, heat capacity and
electrical resistivity of PuLuPd, with =0, 0.1, 0.2, 0.5,
0.8 and 1. PuPd is an antiferromagnetic heavy fermion compound with
~K. With increasing Lu doping, both the Kondo and RKKY interaction
strengths fall, as judged by the Sommerfeld coefficient and N\'eel
temperature . Fits to a crystal field model of the resistivity also
support these conclusions. The paramagnetic effective moment
increases with Lu dilution, indicating a decrease in the
Kondo screening. In the highly dilute limit, approaches
the value predicted by intermediate coupling calculations. In conjunction with
an observed Schottky peak at 60~K in the magnetic heat capacity,
corresponding to a crystal field splitting of 12~meV, a mean-field
intermediate coupling model with nearest neighbour interactions has been
developed.Comment: 13 pages, 13 figure
Morphological and functional effects of graphene on the synthesis of uranium carbide for isotopes production targets
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