Electron-Phonon Interaction in NbB_2 : A Comparison with MgB_2

Details Electron-Phonon Interaction in NbB_2 : A Comparison with MgB_2 Electron-Phonon Interaction in NbB_2 : A Comparison with MgB_2

2002-10-04

arxiv.org/abs/cond-mat/0210091v1

Solid State Commun. 125/126, 323-326 (2003)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1016/S0038-1098(02)00819-0

We present a comparison of electron-phonon interaction in NbB_2 and MgB_2, calculated using full-potential, density-functional-based methods in P6/mmm crystal structure. Our results, described in terms of (i) electronic structure, (ii) phonon density of states F(\omega), (iii) Eliashberg function \alpha ^2F(\omega), and (iv) the solutions of the isotropic Eliashberg gap equation, clearly show significant differences in the electron-phonon interaction in NbB_2 and MgB_2. We find that the average electron-phonon coupling constant \lambda is equal to 0.59 for MgB_2 and 0.43 for NbB_2, leading to superconducting transition temperature T_c of around 22 K for MgB_2 and 3 K for NbB_2.

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