Measurement of unique magnetic and superconducting phases in oxygen-doped high-temperature superconductors La_2-xSr_xCuO_4+y

摘要

We present a combined magnetic neutron scattering and muon spin rotation study of the nature of the magnetic and superconducting phases in electronically phase separated La2-xSrxCuO4+y, x=0.04, 0.065, 0.09. For all samples, we find long-range modulated magnetic order below TN≃Tc=39 K. In sharp contrast to oxygen-stoichiometric La2-xSrxCuO4, we find that the magnetic propagation vector as well as the ordered magnetic moment is independent of Sr content and consistent with that of the “striped” cuprates. Our study provides direct proof that superoxygenation in La2-xSrxCuO4+y allows the spin stripe ordered phase to emerge and phase separate from superconducting regions with the hallmarks of optimally doped oxygen-stoichiometric La2-xSrxCuO4.