β-tin→Imma→sh Phase Transitions of Germanium

Chen, Xiao-Jia; Zhang, Chao; Meng, Yue; Zhang, Rui-Qin; Lin, Hai-Qing; Struzhkin, Viktor V.; Mao, Ho-kwang

doi:10.1103/PhysRevLett.106.135502

Title: $β - tin \to I m m a \to sh$ Phase Transitions of Germanium

Journal Article · Tue Mar 01 00:00:00 EST 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.106.135502· OSTI ID:1381305

Chen, Xiao-Jia; Zhang, Chao; Meng, Yue; Zhang, Rui-Qin; Lin, Hai-Qing; Struzhkin, Viktor V.; Mao, Ho-kwang

New paths were designed for the investigations of the β - tin → I m m a → sh phase transitions in nanocrystalline Ge under conditions of hydrostatic stress. A second-order transition between the β -tin and I m m a phases was identified at 66 GPa, and a first-order transition between the I m m a and sh phases was determined at 90 GPa. Superconductivity was obtained up to 190 GPa using the acquired structural data in first-principles calculations. This provides evidence that the standard electron-phonon coupling mechanism is responsible for superconductivity in Ge, as evidenced by the good agreement between the calculations and existing experiments.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: SC0001057

OSTI ID:: 1381305

Journal Information:: Physical Review Letters, Vol. 106, Issue 13; Related Information: EFree partners with Carnegie Institution of Washington (lead); California Institute of Technology; Colorado School of Mines; Cornell University; Lehigh University; Pennsylvania State University; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Title: β - tin → I m m a → sh Phase Transitions of Germanium

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Title: $β - tin \to I m m a \to sh$ Phase Transitions of Germanium