ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Recent results of perturbed-angular-correlation experiments on La2−xSrxCuO4+y, for x zero1 or small,2 indicate that as-prepared materials contain an excess of oxygen which may be removed by annealing in vacuum. Inspired by these results, we have explored the magnetic behavior of Sr-doped materials that have received treatment by vacuum annealing, our primary interest being the observation of a bulk transition to the apparent spin-glass phase which occurs at low temperatures (Tf〈20 K) for 0.02≤x≤0.07.3 While as-prepared materials do not exhibit a bulk transition at Tf, we observe a clear anomaly at Tf in vacuum-annealed samples, below which the latter also display the magnetic irreversibility characteristic of spin glasses. The values of Tf obtained from bulk magnetization correspond closely to those derived from microscopic probes.3 We will discuss the results of measurements of the bulk magnetization in vacuum-annealed samples with varying Sr content, together with information from recent experiments, utilizing ESR and NMR, designed to improve our understanding of the microscopic nature of the moments which participate in the ordering at Tf and of the nature of the ordering itself.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.344864
Permalink
