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Pressure-driven significant phonon mode softening and robust superconductivity in layered germanium phosphide

Journal Article · · Journal of Materials Chemistry. A
DOI:https://doi.org/10.1039/d0ta07243e· OSTI ID:1673422
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [2];  [4];  [5];  [6]
  1. Qufu Normal University (China); Center for High Pressure Science and Technology Advanced Research, Beijing (China); University of Missouri
  2. Qufu Normal University (China)
  3. University of Missouri, Columbia, MO (United States)
  4. Center for High Pressure Science and Technology Advanced Research, Beijing (China)
  5. University of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Laboratory, Guangdong (China)
  6. Qufu Normal University (China); Institute of Applied Physics and Computational Mathematics, Beijing (China)

Recent discoveries in high pressure science have revealed entirely unexpected chemical behavior of two-dimensional (2D) materials. However, there is still a lack of unambiguous insight on the pressure-driven behavior of in-plane bonds in the 2D layered structures. Layered germanium phosphide (GeP5) is a metal with honeycomb-like sheets structurally similar to semiconducting black phosphorous, but with electrical conductivity ten times higher than that of graphite. Here, we report a remarkable pressure-dependent structural transformation that includes lengthening of the main in-plane bonds under pressure, although practically high pressure usually leads to shorter stiffer bonds. In situ Raman measurements show that there is significant phonon mode softening through the 2D–3D structural reconstruction, correlating with the in-plane bond extensions in GeP5 upon compression. This is accompanied by unusually superconducting behavior, on both sides of the transformation. Furthermore, this superconductivity with a maximum transition value of 10.5 K at 13.5 GPa shows a robust character without obvious reduction up to 60 GPa and is accompanied by pressure-induced amorphization in GeP5. Our experimental results, together with those from first principles calculations, not only provide the detailed high-pressure phase diagram of GeP5 but also connect the pressure-dependent bond extension with enhanced superconductivity.

Research Organization:
University of Missouri, Columbia, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0019114
OSTI ID:
1673422
Alternate ID(s):
OSTI ID: 1712453
OSTI ID: 1664621
Journal Information:
Journal of Materials Chemistry. A, Journal Name: Journal of Materials Chemistry. A Journal Issue: 38 Vol. 8; ISSN 2050-7488
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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