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Phys. Rev. B 64, 174505 (2001) [8 pages]

Diagonal static spin correlation in the low-temperature orthorhombic Pccn phase of La1.55Nd0.4Sr0.05CuO4

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S. Wakimoto* and J. M. Tranquada
Physics Department, Brookhaven National Laboratory, Upton, New York 11973

T. Ono, K. M. Kojima, and S. Uchida
Department of Applied Physics, University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-8656, Japan

S.-H. Lee and P. M. Gehring
National Institute of Standards and Technology, NCNR, Gaithersburg, Maryland 20889

R. J. Birgeneau
Department of Physics and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7

Received 6 March 2001; revised 24 May 2001; published 5 October 2001

Elastic neutron-scattering measurements have been performed on La1.55Nd0.4Sr0.05CuO4, which exhibits a structural phase transition at Ts∼60 K from the low-temperature orthorhombic Bmab phase (labeled LTO1) to the low-temperature orthorhombic Pccn phase (labeled LTO2). At low temperatures, well below Ts, elastic magnetic peaks are observed at the “diagonal” incommensurate (IC) positions (0,1±0.055,0), with the modulation direction only along the orthorhombic b axis, just as in Nd-free La1.95Sr0.05CuO4. In the present study, the one dimensionality of the IC modulation, which is naturally explained by a stripe model, is clearly demonstrated with our “single-domain” crystal. The temperature dependence of the IC peak intensity suggests a substantial contribution from the Nd3+ spins below ∼3 K. Consistent with this, the L dependence of the magnetic scattering is accurately accounted for by a model in which the contribution of the Nd3+ spins is explicitly included.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.64.174505
DOI:
10.1103/PhysRevB.64.174505
PACS:
74.72.Dn, 75.30.Fv, 75.50.Ee

*Also at Massachusetts Institute of Technology, Cambridge, MA 02139. Present address: Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7.

 
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