Magnetic correlations in the spin chains of Sr2.5Ca11.5Cu24O41 studied by μ+SR

Abstract The magnetic correlations in the strongly hole-doped spin chains of Sr 2.5 Ca 11.5 Cu 24 O 41 have been studied with μ + SR. Zero field and longitudinal field μ + SR data prove the development of static magnetic order at temperatures below T N ≃2.3. However, the measured spectra markedly differ from the findings in other magnetically ordered compounds. In particular, in the ordered state we observe a peculiar nearly constant muon polarization at short times.