Electron-phonon coupling in the rare-earth metals
- Laboratory of Applied Physics, The Technical University of Denmark, DK-2800 Lyngby, Denmark (DK)
- Joint Institute for Nuclear Research, Dubna, U.S.S.R. (SU)
We have estimated the strength of the mass enhancement of the conduction electrons due to electron-phonon interaction in the rare metals Sc, Y, and La--Lu. The underlying self-consistent energy bands were obtained by means of the scalar relativistic linear-muffin-tin-orbital method, and the electron-phonon parameters were calculated within the Gaspari-Gyorffy formulation. For the heavier rare earths Gd--Tm spin polarization was included both in the band-structure calculations and in the treatment of the electron-phonon coupling to take into account the spin splitting of the conduction electrons induced by the 4{ital f} states. The calculated electron-phonon mass enhancement {lambda} exhibits a pronounced variation through the series with a maximum value of 1.07 in Pr and a minimum of 0.3 in Ho. We analyze the experimental data from specific heat and de Haas--van Alphen measurements in light of the calculated electron-phonon contribution to the mass enhancement. Finally, we present for the superconducting elements Sc, Y, La, and Lu a comparison with the empirical electron-phonon coupling constants derived from the transition temperatures.
- OSTI ID:
- 6950327
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:10; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
BAND THEORY
ELECTRON-PHONON COUPLING
ELECTRONIC STRUCTURE
ELEMENTS
METALS
MUFFIN-TIN POTENTIAL
PHYSICAL PROPERTIES
POTENTIALS
RARE EARTHS
SCANDIUM
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
YTTRIUM