1/8 problems in the La-, Bi- and Y-based cuprates and new anomalies in the overdoped region of the La-based cuprate

Y. Koike, M. Akoshima, T. Adachi, N. Kakinuma, T. Noji, Y. Ono, T. Nishizaki, N. Kobayashi, I. Watanabe, K. Nagamine

Research output: Contribution to journalArticle

Abstract

Recent experimental work on the 1/8 problem by our group is reviewed not only in the La-based cuprate but also in the Bi- and Y-based ones. In the partially Zn-substituted Bi2Sr2Ca1-xYx(Cu 1-yZny)2O8+δ, we have found anomalous suppression of superconductivity at x = 0.30 = 0.35, where the hole concentration per Cu p ∼ 1/8. Moreover, it has been revealed from the μSR measurements that the Cu-spin fluctuations exhibit slowing-down behavior at low temperatures in these samples. These results are suggestive of the stripe correlations of holes and spins tending to be pinned by Zn at p ∼ 1/8 in the Bi-based cuprate as well as in the La-based cuprate. In Y1-xCaxBa2Cu3O7-δ, the 60 K plateau of Tc has been found not to be correlated with the oxygen content but to be interpreted as being due to the suppression of superconductivity at p ∼ 1/8. Accordingly, we conclude that the 1/8 problem is common to all high-Tc cuprates with the CuO2 plane. Moreover, we have found transport and Tc anomalies around x = 0.22 in La2-xSrxCu1-yMyO4 (M = Zn, Ga), suggesting a possibility that an order of holes and/or spins is formed or fluctuates in these samples in the overdoped region.

Original languageEnglish
Pages (from-to)3546-3551
Number of pages6
JournalInternational Journal of Modern Physics B
Volume13
Issue number29-31
DOIs
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics

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