title: Measurement of unique magnetic and superconducting phases in oxygen-doped high-temperature superconductors La(2-x)Sr(x)CuO(4+y).
abstract: 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 La(2-x)Sr(x)CuO(4+y), x=0.04, 0.065, 0.09. For all samples, we find long-range modulated magnetic order below T(N) is approximately equal to Tc=39 K. In sharp contrast to oxygen-stoichiometric La(2-x)Sr(x)CuO(4), 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 La(2-x)Sr(x)CuO(4+y) allows the spin stripe ordered phase to emerge and phase separate from superconducting regions with the hallmarks of optimally doped oxygen-stoichiometric La(2-x)Sr(x)CuO(4).
authors: Nanoscience Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark.
authors: L
authors: L
authors: Udby
authors: Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
authors: J
authors: J
authors: Larsen
authors: Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
authors: N B
authors: NB
authors: Christensen
authors: Institut Laue-Langevin, 38042 Grenoble Cedex 9, France.
authors: M
authors: M
authors: Boehm
authors: Laboratory for Neutron Scattering, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.
authors: Ch
authors: Ch
authors: Niedermayer
authors: University of Hartford, West Hartford, Connecticut 06117, USA.
authors: H E
authors: HE
authors: Mohottala
authors: Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
authors: T B S
authors: TB
authors: Jensen
authors: Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark and Helmholtz Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany.
authors: R
authors: R
authors: Toft-Petersen
authors: Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
authors: F C
authors: FC
authors: Chou
authors: Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
authors: N H
authors: NH
authors: Andersen
authors: Nanoscience Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark.
authors: K
authors: K
authors: Lefmann
authors: Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA.
authors: B O
authors: BO
authors: Wells