9 research outputs found
Spin-phonon interaction and band effects in the high-T_C superconductor HgBa_2CuO_4
Band calculations show that a stripe-like anti-ferromagnetic spin wave is
enforced by a 'half-breathing' phonon distortion within the CuO plane of
HgBa_2CuO_4. This spin-phonon coupling is increased further by shear distortion
and by increased distance between Cu and apical oxygens. The effects from
spin-phonon coupling are consistent with many observations in high-T_C
materials. Spin-phonon coupling can be important for the mechanism of spin
fluctuations and superconductivity, although the effects are quantitatively
weak when using the local density potential.Comment: 4 pages, 1 figur
Intrinsic and carrier density effects on the pressure dependence of Tc of high-temperature superconductors
The pressure dependence of
Superconducting materials - a topical overview
A topical overview on the state of the art and science of superconducting
materials is presented. The relation of atomic structure and suggested
superconductivity mechanisms as well as possible applications are discussed for
the various families of superconducting materials discovered within the last 25
years.Comment: 70 pages, 28 figures; to be published in: A. V. Narlikar (Ed.),
Frontiers in Superconducting Materials, Springer Verlag, Berlin, 2004; for a
manuscript featuring higher-resolution figures and for associated information
see http://wwwifp.fzk.de/ISAS/index.htm