Giblin, S. R., Freeman, P. G., Hradil, K., Prabhakaran, D., & Boothroyd, A. T. (2008). Spin reorientation and glassy dynamics in La ₁.₅₅ Sr ₀.₄₅ NiO₄. Physical Review B, 78(184423). https://doi.org/10.1103/physrevb.78.184423
Condensed Matter Physics; Electronic, Optical and Magnetic Materials; 71.27.+a; 75.25.+z; 76.75.+i
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Abstract:
The magnetism of charge-stripe-ordered La1.55Sr0.45NiO4 was studied by a combination of neutron diffraction, muon-spin relaxation (μSR), and bulk susceptibility. Long-range magnetic ordering was observed at a lower temperature by μSR than by neutron diffraction, consistent with a glassy transition to the ordered phase. A second magnetic transition is detected by all techniques and is consistent with a spin reorientation. On cooling below TSR=42 K the spins reorientate from lying 32.9±0.6° away from the stripe direction at 70 K to 56.8±0.4° at 10 K. The magnetic order was observed by neutron diffraction to have both three-dimensional and two-dimensional (without any correlation along the c axis) characters. μSR measurements confirmed this and are consistent with a single magnetically ordered spin-stripe phase. The effects of checkerboard charge order on the ordered phase and the characteristics of the phase diagram of the spin reorientation in charge-ordered La2−xSrxNiO4 are commented on.
