American Institute of Physics, Journal of Applied Physics, 11(83), p. 7348
DOI: 10.1063/1.367796
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Neutron scattering has been used to study the magnetic correlations in the double-layer manganite La1.2Sr1.8Mn2O7, which exhibits colossal magnetoresistance in the vicinity of the ferromagnetic transition at Tc = 112 K. Over a large temperature range above Tc, there is evidence for two-dimensional magnetic correlations which peak in intensity at the transition. Although the in-plane correlations are predominantly ferromagnetic, a strong canting of spins in neighboring planes within the bilayers, at an angle that is dependent on both the temperature and magnetic field, is observed. There are indications of a crossover to three-dimensional critical scattering very close to Tc, but the nature of the phase transition has yet to be determined. © 1998 American Institute of Physics.