Spin dynamics in CuGeO3 studied by muon spin rotation

A. Lappas, K. Prassides, A. Amato, R. Feyerherm, F. N. Gygax, A. Schenck

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13 Citations (Scopus)

Abstract

We report a muon spin rotation (μSR) study of the magnetic properties of the Cu2+ quasi-one-dimensional CuGeO3 system and its lightly-doped derivative Cu0.97Zn0.03GeO3. Susceptibility measurements on CuGeO3 show a sudden change in the vicinity of 14 K that has been interpreted before as a magnetic transition to a spin-Peierls state. μSR shows no evidence of spin freezing below 14 K, implying that the transition is to a magnetic state with no static (random or ordered) electronic moments. A modest slowing down of the electronic spin dynamics is also identified at this temperature. Similarly, no evidence of a transition to a static magnetic state is found for Cu0.97Zn0.03GeO3 whose susceptibility shows hysteretic behaviour between zero-field and field cooled measurements at 4 K, previously ascribed to spinglass-like behaviour. Given the nature of the muon spin as a local magnetic probe, the present results necessitate a re-interpretation of the origin of the susceptibility anomaly observed in the doped system.

Original languageEnglish
Pages (from-to)223-226
Number of pages4
JournalZeitschrift für Physik B Condensed Matter
Volume96
Issue number2
DOIs
Publication statusPublished - 1994 Jun 1

Keywords

  • 75.90
  • 76.75

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Lappas, A., Prassides, K., Amato, A., Feyerherm, R., Gygax, F. N., & Schenck, A. (1994). Spin dynamics in CuGeO3 studied by muon spin rotation. Zeitschrift für Physik B Condensed Matter, 96(2), 223-226. https://doi.org/10.1007/BF01313287