https://doi.org/10.1007/s100510170049
The magnetism of La1.2Sr1.8Mn2O7
1
Laboratoire de Physico-Chimie de l'État Solide,
Université de Paris-Sud (UMR 8648) , 91405 Orsay
Cedex, France
2
Institut d'Électronique Fondamentale, Université de Paris-Sud (UMR 8622) , 91405 Orsay Cedex, France
Corresponding author: a matias.velazquez@lpces.u-psud.fr
Received:
9
April
2001
Published online: 15 October 2001
The critical behaviour of
La1.2Sr1.8Mn2O7 has been revisited
by means of static macroscopic
magnetic properties measurements. We
present a renewed insight on
its equilibrium properties near
the critical point (
K)
including the determination of
the fundamental characteristics of
a magnetic system (anisotropy,
critical exponents and crossovers
in the vicinity of the
Curie temperature). It appears
that two-dimensional correlations above
TC do not spread very
fast, and that thus the
critical fluctuations regime occurs
in a moderately narrow
temperature range, assessing the
three-dimensional nature of the
ferromagnetic ordering. The higher
temperature contributions to the
physical properties, due to
stacking defects, are interpreted
within the context of the
extensive studies carried out
on thin films.
PACS: 05.70.Fh – Phase transitions: general studies / 05.70.Jk – Critical point phenomena / 64.60.Fr – Equilibrium properties near critical points, critical exponents / 72.80.Ga – Transition-metal compounds
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
