TITLE

Ab initio study on pressure-induced change of effective Coulomb interaction in superconducting yttrium

AUTHOR(S)
Duck Young Kim; Ahuja, Rajeev
PUB. DATE
January 2010
SOURCE
Applied Physics Letters;1/11/2010, Vol. 96 Issue 2, p022510
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Ab initio lattice dynamics based on linear response method are performed for high pressure phase of yttrium to describe electron-phonon coupling and subsequent superconducting behavior. The critical temperature Tc in fcc-Y increases monotonically with pressure up to 9.25 K at 31 GPa, which is quantitatively in excellent agreement with two quasihydrostatic experiments and is qualitatively compatible with recent experiments. The excellent agreement with experiments gives us a better understanding of the effective pseudopotential μ* as well as spectral function α2(ω)F(ω) in yttrium. These results demonstrate that there exists strong electron-phonon coupling in Y within the studied pressure regime, and for lower pressure electron correlation becomes stronger. Generally, it is found that superconductivity in yttrium under pressure can be described quantitatively within standard theory of phonon-mediated superconductivity.
ACCESSION #
47587963

 

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