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26 April 2024 |
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Crystal Symmetry, Electron-Phonon Coupling, and Superconducting Tendencies in Li$_2$Pd$_3$B and Li$_2$Pt$_3$B | | K.-W. Lee
; W. E. Pickett
; | | Date: |
5 Jul 2005 | | Subject: | Superconductivity; Materials Science | cond-mat.supr-con cond-mat.mtrl-sci | | Affiliation: | UC Davis | | Abstract: | After theoretical determination of the internal structural coordinates in Li$_2$Pd$_3$B, we calculate and analyze its electronic structure and obtain the frequencies of the two $A_g$ phonons (40.6 meV for nearly pure Li mode, 13.0 meV for the strongly mixed Pd-Li mode). Pd can be ascribed a $4d^{10}$ configuration, but strong 4d character remains up to the Fermi level. Small regions of flat bands occur at -70 meV at both the $Gamma$ and X points. Comparison of the Fermi level density of states to the linear specific heat coefficient gives a dynamic mass enhancement of $lambda$ = 0.75. Rough Fermi surface averages of the deformation potentials $D$ of individual Pd and Li displacements are obtained. While <$D_{Li}$> is small, <$D_{Pd}> ~ 1.15 eV/AA is sizable, and a plausible case exists for its superconductivity at 8 K being driven primarily by coupling to Pd vibrations. The larger d bandwidth in Li$_2$Pt$_3$B leads to important differences in the bands near the Fermi surface. The effect on the band structure of spin-orbit coupling plus lack of inversion is striking, and is much larger in the Pt compound. | | Source: | arXiv, cond-mat/0507105 | | Services: | Forum | Review | PDF | Favorites | |
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