In:
Journal of Applied Physics, AIP Publishing, Vol. 83, No. 11 ( 1998-06-01), p. 6374-6378
Abstract:
Neutron diffuse scattering in the form of rod-like features has been observed in single crystals of the layered CMR material La2−2xSr1+2xMn2O7 (x=0.4,0.36), consistent with the presence of 2D ferromagnetic spin correlations. These diffuse features are observed over a wide temperature region. However, their coherence length does not appear to diverge at TC, although there is evidence of the development of three-dimensional correlations around ferromagnetic reflections of the 3D-ordered magnetic structure close to TC. Quasi-elastic neutron scattering on a ceramic sample of x=0.3 shows that the lifetime of these ferromagnetic correlations increases at T→TC. They exhibit a spin-diffusion constant above TC of ∼5 meV Å2, much lower than that reported for La2/3Ca1/3MnO3. We discuss the relationship of these magnetic correlations to models of the ferromagnetic transition in CMR compounds.
Type of Medium:
Online Resource
ISSN:
0021-8979
,
1089-7550
Language:
English
Publisher:
AIP Publishing
Publication Date:
1998
detail.hit.zdb_id:
220641-9
detail.hit.zdb_id:
3112-4
detail.hit.zdb_id:
1476463-5
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