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

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.
Authors:
 [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)
Publication Date:
Report Number(s):
LLNL-JRNL-694082
Journal ID: ISSN 2045-2322
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electronic properties and materials; phase transitions and critical phenomena; structure of solids and liquids
OSTI Identifier:
1346134

Antonangeli, Daniele, Farber, Daniel L., Bosak, Alexei, Aracne, Chantel M., Ruddle, David G., and Krisch, Michael. Phonon triggered rhombohedral lattice distortion in vanadium at high pressure. United States: N. p., Web. doi:10.1038/srep31887.
Antonangeli, Daniele, Farber, Daniel L., Bosak, Alexei, Aracne, Chantel M., Ruddle, David G., & Krisch, Michael. Phonon triggered rhombohedral lattice distortion in vanadium at high pressure. United States. doi:10.1038/srep31887.
Antonangeli, Daniele, Farber, Daniel L., Bosak, Alexei, Aracne, Chantel M., Ruddle, David G., and Krisch, Michael. 2016. "Phonon triggered rhombohedral lattice distortion in vanadium at high pressure". United States. doi:10.1038/srep31887. https://www.osti.gov/servlets/purl/1346134.
@article{osti_1346134,
title = {Phonon triggered rhombohedral lattice distortion in vanadium at high pressure},
author = {Antonangeli, Daniele and Farber, Daniel L. and Bosak, Alexei and Aracne, Chantel M. and Ruddle, David G. and Krisch, Michael},
abstractNote = {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.},
doi = {10.1038/srep31887},
journal = {Scientific Reports},
number = 1,
volume = 6,
place = {United States},
year = {2016},
month = {8}
}