New High Temperature Diboride Superconductors: AgB2 and AuB2
S. K. Kwon, S. J. Youn, K. S. Kim, B. I. Min
Abstract
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 Tc = 59 K and 72 K, respectively. These are about 2 ~ 3 times higher than the estimated Tc = 27 K in MgB2 and almost comparable to those in cuprate superconductors.
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