New High Temperature Diboride Superconductors: AgB2 and AuB2

Details New High Temperature Diboride Superconductors: AgB2 and AuB2 New High Temperature Diboride Superconductors: AgB2 and AuB2

2001-06-23

arxiv.org/abs/cond-mat/0106483v1

Physics

Condensed Matter

Superconductivity

4 pages including 4 figures

Scientific paper

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 \lambda is 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.

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