Cu spin dynamics in the overdoped regime of La2-x Srx Cu1-y Zny O4 probed by muon spin relaxation

Risdiana, T. Adachi, N. Oki, S. Yairi, Y. Tanabe, K. Omori, Y. Koike, Takao Suzuki, I. Watanabe, A. Koda, W. Higemoto

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Abstract

Muon-spin-relaxation measurements have been performed for partially Zn-substituted La2-x Srx Cu1-y Zny O4 with y=0-0.10 in the overdoped regime up to x=0.30. In the 3% Zn-substituted samples up to x=0.27, exponential-like depolarization of muon spins has been observed at low temperatures, indicating a Zn-induced slowing down of the Cu spin fluctuations. The depolarization rate decreases with increasing x, and almost no fast depolarization of muon spins has been observed for x=0.30 where superconductivity disappears. The present results suggest that there is no quantum critical point at x∼0.19. These results are discussed in terms of the stripe-pinning model and the phase-separation model.

Original languageEnglish
Article number054516
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number5
DOIs
Publication statusPublished - 2008 Feb 26
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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