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



In this paper we present a thorough analysis of two systems magnetically inhomogeneous: the manganite La 0.7 Sr 0.3 MnO 3/MgO and the amorphous alloy Cu 90 Co 10 . 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. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

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