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

M. S. Reis (), V. S. Amaral, R. S. Sarthour and I. S. Oliveira

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 50, issue 1, 99-103

Abstract: 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

Keywords: 05.70.Ce Thermodynamic functions and equations of state; 05.70.Fh Phase transitions: general studies (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2006-00065-5

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