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Adiabatic Electron-Phonon Interaction and High-Temperature Thermodynamics of A15 Compounds

Delaire, O. and Lucas, M. S. and Muñoz, J. A. and Kresch, M. and Fultz, B. (2008) Adiabatic Electron-Phonon Interaction and High-Temperature Thermodynamics of A15 Compounds. Physical Review Letters, 101 (10). Art. No. 105504. ISSN 0031-9007. doi:10.1103/PhysRevLett.101.105504.

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Inelastic neutron scattering was used to measure the phonon densities of states of the A15 compounds V_3Si, V_3Ge, and V_3Co at temperatures from 10 to 1273 K. It was found that phonons in V_3Si and V_3Ge, which are superconducting at low temperatures, exhibit an anomalous stiffening with increasing temperature, whereas phonons in V_3Co have a normal softening behavior. First-principles calculations show that this anomalous increase in phonon frequencies at high temperatures originates with an adiabatic electron-phonon coupling mechanism. The anomaly is caused by the thermally induced broadening of sharp peaks in the electronic density of states of V_3Si and V_3Ge, which tends to decrease the electronic density at the Fermi level. These results show that the adiabatic electron-phonon coupling can influence the phonon thermodynamics at temperatures exceeding 1000 K.

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Fultz, B.0000-0002-6364-8782
Additional Information:© 2008 The American Physical Society. (Received 15 April 2008; published 5 September 2008) This work has benefited from the use of LANSCE at the Los Alamos National Laboratory, funded by the U.S. DOE under Contract No. W-7405-ENG-36. Use of Oak Ridge National Laboratory was also supported by the U.S. DOE. This work was supported by the National Science Foundation through TeraGrid resources provided by NCSA under Grant No. DMR060011N and by DOE BES Grant No. DE-FG02-03ER46055.
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Department of Energy (DOE)W-7405-ENG-36
Department of Energy (DOE)DE-FG02-03ER46055
Issue or Number:10
Record Number:CaltechAUTHORS:DELprl08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11575
Deposited By: Archive Administrator
Deposited On:07 Sep 2008 07:51
Last Modified:08 Nov 2021 22:00

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