Order parameter and barrier height in LaSrMnO cluster glasses

Abstract

Using the results of magnetization measurements of LaSrMnO cluster glasses, it is shown that the concentration of frozen magnetic moments exponentially decreases with the increase of temperature. We find that temperature dependence of the order parameter q, of the form q - q (T) ∼ T- 5 / 2, is universal characteristic of the investigated cluster glasses and that the barrier height Δ closely follows the quadratic relation to the temperature, Δ ≈ B T2. © 2009 Elsevier B.V. All rights reserved.