2006/07/06 by Prabhakar P. Singh, Singh, Prabhakar P.
Physics and Astronomy · #Advanced Chemical Physics Studies #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0607176
8 pages, 7 figures, Added linear-response calculations using full-potential LMTO method
arxiv created 2006/12/27 · arxiv updated 2009/12/01
To understand the pressure-induced changes in the electronic structure and the electron-phonon interaction in yttrium, we have studied hexagonal close-packed (hcp) yttrium, stable at ambient pressure and double hexagonal close-packed (dhcp) yttrium, stable up to around 44 GPa, using density-functional-based methods. Our results show that as one goes from hcp yttrium to dhcp yttrium, there is (i) a substantial charge-transfer from s->d with extensive modifications of the d-band and a sizable reduction in the density of states at the Fermi energy, (ii) a substantial stiffening of phonon modes with the electron-phonon coupling covering the entire frequency range, (iii) an increase in the electron-phonon coupling constant λfrom 0.55 to 1.24, leading to a change in the superconducting transition temperature Tc from 0.3 K to 15.3 K for μ*=0.2.