The interplay of charge order and magnetism in the one-dimensional quantum spin system Sr14Cu24O41

Abstract We report muon Knight shift measurements on single crystals of Sr 14 Cu 24 O 41 and Ca 9 La 5 Cu 24 O 41 to determine the muon stopping site in the isostructural compounds of the (Sr,Ca,La) 14 Cu 24 O 41 series. A site close to the ladder oxygen (0, 0.29, 0) is found. In addition, the magnetic correlations in the system Sr 14 Cu 24 O 41 have been studied by zero field μ + SR between room temperature and 2 K . Quasi-static muon spin relaxation is found below 10 K , whereas thermodynamic and neutron scattering reveal a singlet ground state.