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Title: Phonon triggered rhombohedral lattice distortion in vanadium at high pressure

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep31887· OSTI ID:1346134
 [1];  [2];  [3];  [4];  [4];  [3]
  1. Sorbonne Univ. - UPMC, Paris (France)
  2. Univ. of California, Santa Cruz, CA (United States)
  3. European Synchrotron Radiation Facility, Grenoble (France)
  4. 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
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (3)

Pressure effect on Kohn anomaly and electronic topological transition in single-crystal tantalum journal August 2019
Melting curve and phase diagram of vanadium under high-pressure and high-temperature conditions journal September 2019
Kohn Anomaly and Phase Stability in Group VB Transition Metals journal March 2018