Volume 117, Number 1, January 2017
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||28 February 2017|
Charge inhomogeneity in an expanded fluid metal: X-ray Compton scattering observation
1 Graduate School of Science, Kyoto University - Kyoto 606-8502, Japan
2 Graduate School of Integrated Arts and Sciences, Hiroshima University - Higashi Hiroshima 739-8521, Japan
3 Graduate School of Engineering, Kyoto University - Kyoto 606-8501, Japan
4 A.L.M.T. Corp. - Itami, Hyogo 664-0016, Japan
5 Japan Synchrotron Radiation Research Institute, SPring-8 - Hyogo 679-5198, Japan
6 National Synchrotron Radiation Research Center - Hsinchu 30076, Taiwan
Received: 28 October 2016
Accepted: 6 February 2017
X-ray Compton scattering measurements have been carried out for fluid rubidium (Rb) from near the melting point up to the critical regions. The electron kinetic energy (KE) was derived from the valence Compton profiles and its relative variation as a function of the fluid density was compared with that of the electron gas model. Reduction in the KE occurs more slowly than that predicted by the model as the fluid density decreases and an apparent deviation in the KE from the model is observed at the densities where the fluid is still metallic. These findings suggest that a fluctuation intrinsic to the low-density electron gas causes charge inhomogeneity in valence electrons in real fluid rubidium, being coupled with ionic density fluctuations.
PACS: 71.22.+i – Electronic structure of liquid metals and semiconductors and their alloys / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EPLA, 2017
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