Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.105702
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Funding
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES) [DE-SC0001057]
- DOE-BES [DE-AC02-06CH11357]
- DOE-NNSA (CDAC)
- NSF
- Natural Sciences and Engineering Research Council of Canada, University of Washington
- Simon Fraser University
- APS
- Balzan Foundation, National Natural Science Foundation of China [50601021, 50701038, 60776014, 60876002, 50920105101, 10979002]
- Zhejiang University-Helmholtz Cooperation Fund
- Ministry of Education of China
- Doctoral Education Foundation
- China State Oversea Foundation
- Department of Science and Technology of Zhejiang Province
- Baoyugang Foundation of Zhejiang University
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Using high-pressure synchrotron x-ray absorption spectroscopy, we observed the Ce 4f electron in Ce75Al25 metallic glass transform from its ambient localized state to an itinerant state above 5 GPa. A parallel x-ray diffraction study revealed a volume collapse of about 8.6%, coinciding with 4f delocalization. The transition started from a low-density state below 1.5 GPa, went through continuous densification ending with a high-density state above 5 GPa. This new type of electronic polyamorphism in densely packed metallic glass is dictated by the Ce constituent, and is fundamentally distinct from the well-established structural polyamorphism in which densification is caused by coordination change and atomic rearrangement.
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