Physics – Condensed Matter – Superconductivity
Scientific paper
2003-11-04
J. Phys. Soc. Jpn. 73 (2004) No.4 991.
Physics
Condensed Matter
Superconductivity
16 pages, 12 figures, J. Phys. Soc. Jpn. submitted
Scientific paper
10.1143/JPSJ.73.991
Magnetic excitation spectra c"(q,w) of YBa2Cu3Oy, La2-xSrxCuO4, La2-y-xNdySrxCuO4 and Nd2-xCexCuO4 are compared with those of model calculations, where q and w are the wave vector and the energy of the excitations. In the model, the dynamical spin susceptibility is calculated by the expression c(q,w)= c0(q,w)/{1+J(q)c0(q,w)}, where c0(q,w) is obtained by adopting the effective energy dispersion of the quasi particles which can reproduce the shapes of the Fermi surface, and J(q) is the exchange coupling between the Cu-Cu electrons. It is important to consider the experimentally observed quasi particle broadening (G) to reproduce the observed spectra of YBa2Cu3Oy, while to reproduce the data of La2-xSrxCuO4 and La2-y-xNdySrxCuO4, very small G values have to be used, even in the phases without the static "stripe" order. This may be caused by the existence of the "stripe" correlations or "stripe" fluctuations.
Iikubo Satoshi
Ito Masafumi
Kakurai Kazuhisa
Kobayashi Akito
Lee Chul-Ho
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