Spin dynamics in CuGeO3 studied by muon spin rotation |
| |
Authors: | A. Lappas K. Prassides A. Amato R. Feyerherm F. N. Gygax A. Schenck |
| |
Affiliation: | (1) School of Chemistry and Molecular Sciences, University of Sussex, BN1 9QJ Brighton, UK;(2) Institute for Particle Physics, Swiss Federal Institute of Technology (ETH) Zürich, CH-5232 Villigen PSI, Switzerland |
| |
Abstract: | We report a muon spin rotation (SR) 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. SR 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. |
| |
Keywords: | 76.75 75.90 |
本文献已被 SpringerLink 等数据库收录! |
|