- M. Calandra and A. N. Kolmogorov and S. Curtarolo, Search for high T-c in layered structures: The case of LiB,
Physical Review B, vol. 75 no. 14
(April, 2007) .
(last updated on 2009/08/04)
Using electronic structure calculation we study the superconducting properties of the theoretically devised superconductor MS1-LiB (LiB). We calculate the electron-phonon coupling (lambda=0.62) and the phonon frequency logarithmic average ($<$omega $>$(log)=54.6 meV) and show that the LiB critical temperature is in the range of 10-15 K, despite the frozen-phonon deformation potential being of the same order of MgB2. As a consequence, LiB captures some of the essential physics of MgB2 but (i) the electron-phonon coupling due to sigma states is smaller and (ii) the precious contribution of the pi carriers to the critical temperature is lacking. We investigate the possible change in T-c that can be induced by doping and pressure and find that these conditions cannot easily increase T-c in LiB.