9 research outputs found

    Spin-phonon interaction and band effects in the high-T_C superconductor HgBa_2CuO_4

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    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

    Superconducting materials - a topical overview

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    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
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