Phonon triggered rhombohedral lattice distortion in vanadium at high pressure
- Sorbonne Univ. - UPMC, Paris (France)
- Univ. of California, Santa Cruz, CA (United States)
- European Synchrotron Radiation Facility, Grenoble (France)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
In spite of the simple body-centered-cubic crystal structure, the elements of group V, vanadium, niobium and tantalum, show strong interactions between the electronic properties and lattice dynamics. Further, these interactions can be tuned by external parameters, such as pressure and temperature. We used inelastic x-ray scattering to probe the phonon dispersion of single-crystalline vanadium as a function of pressure to 45 GPa. Our measurements show an anomalous high-pressure behavior of the transverse acoustic mode along the (100) direction and a softening of the elastic modulus C44 that triggers a rhombohedral lattice distortion occurring between 34 and 39 GPa. Lastly, our results provide the missing experimental confirmation of the theoretically predicted shear instability arising from the progressive intra-band nesting of the Fermi surface with increasing pressure, a scenario common to all transition metals of group V.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1346134
- Report Number(s):
- LLNL-JRNL-694082
- Journal Information:
- Scientific Reports, Vol. 6, Issue 1; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Pressure effect on Kohn anomaly and electronic topological transition in single-crystal tantalum
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journal | August 2019 |
Melting curve and phase diagram of vanadium under high-pressure and high-temperature conditions
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journal | September 2019 |
Kohn Anomaly and Phase Stability in Group VB Transition Metals
|
journal | March 2018 |
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