Eur. Phys. J. B 50, 99-103 (2006)
https://doi.org/10.1140/epjb/e2006-00065-5

Physical meaning and measurement of the entropic parameter q in an inhomogeneous magnetic systems

¹ Departamento de Física and CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal
² Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150 Urca, 22290-180 Rio de Janeiro-RJ, Brasil

Corresponding author: ^a marior@fis.ua.pt

Received: 19 October 2005
Revised: 5 December 2005
Published online: 20 February 2006

Abstract

In this paper we present a thorough analysis of two systems magnetically inhomogeneous: the manganite La_0.7Sr_0.3MnO₃/MgO and the amorphous alloy Cu₉₀Co₁₀. In both cases, the non-extensive statistics yield a faithful description of the magnetic behavior of the systems. In the model proposed here, the inhomogeneous magnetic system is composed by many Maxwell-Boltzmann homogeneous bits and the entropic parameter q is related to the moments of the distribution of the inhomogeneous quantity. From the analysis of Scanning Tunnelling Spectroscopy (STS) images, the q parameter can be directly measured.