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Acoustical-Mode-Driven Electron-Phonon Coupling in Transition-Metal Diborides | | Prabhakar P. Singh
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18 Dec 2002 | | Journal: | Physical Review B 67, 132511 (2003) | | Subject: | Superconductivity; Materials Science | cond-mat.supr-con cond-mat.mtrl-sci | | Abstract: | We show that the electron-phonon coupling in the transition-metal diborides NbB2 and TaB2 is dominated by the longitudinal acoustical (LA) mode, in contrast to the optical E_{2g} mode dominated coupling in MgB2. Our ab initio results, described in terms of phonon dispersion, linewidth, and partial electron-phonon coupling along Gamma to A, also show that (i) NbB2 and TaB2 have a relatively weak electron-phonon coupling, (ii) the E_{2g} linewidth is an order of magnitude larger in MgB2 than in NbB2 or TaB2, (iii) the E_{2g} frequency in NbB2 and TaB2 is considerably higher than in MgB2, and (iv) the LA frequency at A for TaB2 is almost half of that of MgB2 or NbB2. | | Source: | arXiv, cond-mat/0212443 | | Services: | Forum | Review | PDF | Favorites | |
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