New High Temperature Diboride Superconductors: AgB2 and AuB2

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Based on electronic structure calculations, we have found that noble metal diborides, AgB2 and AuB2, are potential candidates for conventional BCS-type high temperature superconductors. B 2p density of states dominates at the Fermi level in comparison with Ag 4d and Au 5d states. Furthermore, the electron-phonon coupling constant λis much larger in AgB2 and AuB2 than in MgB2. Estimated transition temperatures for AgB2 and AuB2 are T_c = 59 K and 72 K, respectively. These are about 2 ~ 3 times higher than the estimated T_c = 27 K in MgB2 and almost comparable to those in cuprate superconductors.
4 pages including 4 figures

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Superconductivity, Materials Science

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http://salesiana.dossiersoluciones.com/handle/123456789/17921

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0106483
 http://arxiv.org/abs/cond-mat/0106483

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arXiv