Volume 42, Number 3, May I 1998
|Page(s)||301 - 306|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Magnetic coherence above the Curie point in ferromagnetic LaSrMnO manganites
Laboratoire Léon Brillouin, Commissariat à l'Energie
Atomique, Saclay, 91191 Gif-sur-Yvette, France
2 Service de Physique de l'Etat Condensé, Commissariat à l'Energie Atomique, Saclay, 91191 Gif-sur-Yvette, France
3 Laboratoire de Chimie des Solides, Université de Paris-Sud, 91405 Orsay, France
Accepted: 16 March 1998
Small-Angle polarised Neutron Scattering (SANS) measurements have been carried out on a ferromagnetic single crystal. In the vicinity of the Curie point a substantial neutron intensity above appears which indicates the presence of nanometre size inhomogeneities mainly of magnetic origin. The neutron spectra cannot be explained with a picture of spin clusters moving in a paramagnetic background, i.e. magnetic polarons. Rather, a model describing an average magnetic coherence extending over several Mn spins leads to very good fits to the data. This situation is comparable to that encountered in Fe or Ni close to Tc but not completely similar. Indeed, magnetic coherence above is significantly stronger in the manganites where an unusual spin correlation function had to be used to fit the data.
PACS: 72.15.Gd – Galvanomagnetic and other magnetotransport effects / 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 75.40.-s – Critical-point effects, specific heats, short-range order
© EDP Sciences, 1998
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