Observation of 3D Heisenberg-like ferromagnetism in single crystal La_0.875Sr_0.125MnO₃

2003/05/26 by Sunil Nair, A. Banerjee, A. V. Narlikar +2
Physics and Astronomy · #cond-mat.str-el #cond-mat.mtrl-sci

paper · pdf · doi:10.1103/physrevb.68.132404

published as Phys. Rev B. 68, 132404 (2003) · 5 Post script Figures attached

arxiv created 2003/05/26 · arxiv updated 2009/11/30

Abstract

We report measurements and analysis of the magnetic critical phenomena in a single crystal of La_0.875Sr_0.125MnO₃. The critical exponents associated with the ferromagnetic transition have been determined from ac susceptibility and dc magnetisation data. Techniques like the Kouvel-Fischer plots, modified Arrots Plots and the critical isotherm analysis were used for this purpose. The values of the the exponents γ, β and δ obtained are found to match very well with those predicted for the 3D Heisenberg model. Our results are consistent with recent numerical calculations and suggest that though the double exchange interaction is driven by the motion of conduction electrons, the effective magnetic interaction near the transition is renormalized to a short range one.

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