Eur. Phys. J. B 23, 307-317 (2001)
https://doi.org/10.1007/s100510170049

The magnetism of La_1.2Sr_1.8Mn₂O₇

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

Abstract

The critical behaviour of La_1.2Sr_1.8Mn₂O₇ 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 T_C 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.