Diagonal static spin correlation in the low-temperature orthorhombic Pccn phase of La1.55Nd0.4Sr0.05CuO4 -: art. no. 174505

Elastic neutron-scattering measurements have been performed on La1.55Nd0.4Sr0.05CuO4, which exhibits a structural phase transition at T(s)similar to 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 T-s, 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 similar to3 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.