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Phys. Rev. B 61, 14366–14369 (2000)

Incommensurate geometry of the elastic magnetic peaks in superconducting La1.88Sr0.12CuO4

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H. Kimura*, H. Matsushita, K. Hirota, and Y. Endoh†
Department of Physics, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan

K. Yamada
Institute for Chemical Research, Kyoto University, Gokasho, Uji 610-0011, Japan

G. Shirane
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973

Y. S. Lee‡, M. A. Kastner, and R. J. Birgeneau
Department of Physics and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

Received 28 December 1999; published in the issue dated 1 June 2000

We report magnetic neutron-scattering measurements of incommensurate magnetic order in a superconducting single crystal of La1.88Sr0.12CuO4. We find that the incommensurate wave vectors which describe the static magnetism do not lie along high-symmetry directions of the underlying CuO2 lattice. The positions of the elastic magnetic peaks are consistent with those found in excess-oxygen doped La2CuO4+y. This behavior differs from the precise magnetic order found in the low-temperature tetragonal La1.6-xNd0.4SrxCuO4 material for which stripes of spin and charge have been observed. These observations have clear implications for any stripe model proposed to describe the static magnetism in orthorhombic La2CuO4-based superconductors.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.61.14366
DOI:
10.1103/PhysRevB.61.14366
PACS:
74.72.Dn, 75.10.Jm, 75.30.Fv, 75.50.Ee

*Present address: Research Institute for Scientific Measurements, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.

†Present address: Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sedani 980-8577, Japan.

‡Present address: Center for Neutron Research, NIST, Gaithersburg, MD 20899.

 
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