Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.205503
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Funding
- EFree, an Energy Frontier Research Center
- U.S. Department of Energy [DESC0001057]
- DOE [DE-FC52-06NA26274]
- CIW
- CDAC
- UNLV
- LLNL
- DOE-NNSA
- DOE-BES
- NSF
- DOE-BES [DE-AC02-06CH11357]
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Detailed knowledge of atomic-scale structural change is essential for understanding the process and mechanism of phase transitions in solids. We present the direct experimental evidence of a precursor lattice in silicon at high pressures. The precursor lattice may appear to coexist dynamically with the host lattice over a large pressure range through rapid lattice fluctuations. The first-principles calculations are used to elucidate a dynamic lattice-fluctuation mechanism that accounts for the experimental observations. This precursor lattice-fluctuation mechanism for the phase transition goes beyond previously considered reconstructive or displacive processes and provides a novel picture of the underlying dynamics.
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