Ab initio calculations of metallic hydrogen are presented. Investigation of the lattice stability of metallic monoatomic phases confirms the main part of conclusions obtained previously by Kagan's group in the framework of the perturbation approach to fourth order in the electron-phonon interaction. The results of the ab initio calculation of the critical temperature T-c of the superconducting transition is also presented. It is shown that T-c can reach very high values about 600 K near the lattice instability in respect to shear deformations. (C) 2001 Published by Elsevier Science Ltd. References: 24
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