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Phys. Rev. B 80, 014505 (2009) [5 pages]

Magnetic ordering in electronically phase-separated La2−xSrxCuO4+y: Neutron diffraction experiments

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L. Udby1, N. H. Andersen1, F. C. Chou2, N. B. Christensen1,3,4, S. B. Emery5, K. Lefmann1,4,6, J. W. Lynn7, H. E. Mohottala5, Ch. Niedermayer3, and B. O. Wells5
1Materials Research Division, Risø DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark
2Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
3Laboratory for Neutron Scattering, ETHZ and PSI, CH-5232 Villigen PSI, Switzerland
4Nanoscience Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
5Department of Physics, University of Connecticut, 2152 Hillside Road, U-3046, Storrs, Connecticut 06269-3046, USA
6ESS-Scandinavia, University of Lund, Stora Algatan 4, 22350 Lund, Sweden
7NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

Received 31 March 2009; revised 8 June 2009; published 9 July 2009

We present results of magnetic neutron diffraction experiments on the codoped superoxygenated La2−xSrxCuO4+y (LSCO+O) system with x=0.09. We find that the magnetic phase is long-range ordered incommensurate antiferromagnetic with a Néel temperature TN coinciding with the superconducting ordering temperature Tc=40 K. The incommensurability value is consistent with a hole doping of nh≈1/8 but in contrast to nonsuperoxygenated La2−xSrxCuO4 with hole doping close to nh≈1/8 the magnetic-order parameter is not field dependent. We attribute this to the magnetic order being fully developed in LSCO+O as in the spin and charge ordered “stripe” compounds La1.48Nd0.40Sr0.12CuO4 and La7/8Ba1/8CuO4.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.014505
DOI:
10.1103/PhysRevB.80.014505
PACS:
74.25.Ha, 74.72.Dn, 75.25.+z
 
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