On the magnetic excitation spectra of high-Tc Cu oxides at energies up to the region far above the resonance energy

Satoshi Iikubo, Masafumi Ito, Akito Kobayashi, Masatoshi Sato, Kazuhisa Kakurai

研究成果: Contribution to journalArticle査読

6 被引用数 (Scopus)

抄録

The magnetic excitation spectra χ″(q,ω) of YBa 2Cu3Oy and La214 systems have been studied. For a sample of the latter system, La1.88Sr0.12CuO 4, χ″(q,ω) has been measured up to ∼30 meV. Existing data of these two kinds of system have been analyzed at energies up to the values far above ωr, around which χ″(q,ω) exhibits the commensurate peak. In the analyses, we have used the phenomenological expression of the generalized magnetic susceptibility χ(q,ω) = χ0(q,ω)/{1 + J(q) χ0(q, ω)}, where χ0(q,ω) is the susceptibility of the electrons without the exchange coupling J(q) among them. In the energy region up to ∼ωr, it has been reported by the authors' group that the expression can explain the characteristics of the q- and ω-dependences of the spectra of YBa2Cu3Oy (YBCO or YBCO y). Here, it is also pointed out that the expression can reproduce the rotation of the four incommensurate peaks of χ″(q,ω) within the a*-b* plane about (π/a, π/a) [or so-called (π,π)] point by 45°, which occurs as ω goes to the region far above ωr from an energy below ωr. This indicates that for the rotation, "stripe" correlation is not required. For La214, the observed and calculated results of χ″(q,ω) are comparatively discussed up to the ω region far above ωr. These results indicate that for YBCO, the characteristics of χ″(q,ω) can be explained qualitatively by the above expression throughout the ω region studied, while for the La214 system, effects of "stripes" on χ″(q,ω), which cannot be explained by the expression, are more significant in the low-energy region of ω (< ωr) than at high energies.

本文言語英語
ページ(範囲)275-278
ページ数4
ジャーナルjournal of the physical society of japan
74
1
DOI
出版ステータス出版済み - 1 2005
外部発表はい

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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