期刊
PHYSICAL REVIEW B
卷 69, 期 20, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.69.201201
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Pressure-induced transformations in the atomic and electronic structure of amorphous germanium (a-Ge) have been investigated by using x-ray absorption spectroscopy (XAS) combined with energy-scanning x-ray diffraction. Our data show that an abrupt change in the local structure and in the electron states near the Fermi level occurs in evaporated a-Ge at a pressure of about 8 GPa. The transformation is clearly detectable by a change in the shape and energy shift in the near-edge structures and by an increase of the average first-neighbor distance measured by XAS. The occurrence of this polyamorphic transition is discussed in light of the recent advances in the study of multiple dense fluid phases.
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