Studies on magnetic excitation spectra of high-Tc superconductors

Masafumi Ito, Yukio Yasui, Satoshi Iikubo, Minoru Soda, Akito Kobayashi, Masatoshi Sato, Kazuhisa Kakurai, Chul Ho Lee, Kazuyoshi Yamada

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Magnetic excitation spectra χ″(q,ω) of YBa 2Cu3Oy, La2-xSrxCuO 4, La2-y-xNdySrxCuO4 and Nd2-xCexCuO4 are compared with those of model calculations, where q and ω are the wave vector and the energy of the excitations. In the model, the dynamical spin susceptibility is calculated by the expression χ(q,ω) = χ0(q,ω)/{1 + J(q)χ0(q,ω)}, where χ0(q,ω) 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 (Γ) to reproduce the observed spectra of YBa2Cu3Oy, while to reproduce the data of La2-xSrxCuO4 and La 2-x-yNdySrxCuO4, very small Γ 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.

Original languageEnglish
Pages (from-to)991-999
Number of pages9
Journaljournal of the physical society of japan
Issue number4
Publication statusPublished - Apr 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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