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Quest for high Tc in layered structures: the case of LiB | | Matteo Calandra
; Aleksey N. Kolmogorov
; Stefano Curtarolo
; | | Date: |
10 Jan 2007 | | Subject: | Superconductivity; Materials Science | | Abstract: | 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 MgB$_2$. As a consequence, LiB captures some of the essential physics of MgB$_2$ 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. | | Source: | arXiv, cond-mat/0701199 | | Services: | Forum | Review | PDF | Favorites | |
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