authors 
Navarro, FAR; Reis, MS; Lenzi, EK; Oliveira, IS 
nationality 
International 
journal 
PHYSICA ASTATISTICAL MECHANICS AND ITS APPLICATIONS 
author keywords 
manganites; nonextensive statistics; partial trace 
keywords 
COLOSSAL MAGNETORESISTIVE MANGANITES; STATISTICALMECHANICS; EVIDENCES; BEHAVIOR 
abstract 
We investigate the magnetic properties of a composed nonextensive system. The work is motivated by recent proposals that manganites are magnetically nonextensive objects, according to Tsallis statistics. We consider a twoparts composed system, AB (both spins 1/2), and calculate 2 selfconsistently the partial magnetizations in the mean field approximation, MA and MB, for the cases the coupling between the subsystems is either ferro or antiferromagnetic. This involves the notion of partial trace in the nonextensive statistics. For temperatures below the magnetic ordering temperatures, and q not equal 1, we found strong disagreement between the M vs. T curves calculated from the total 4 x 4 Hilbert space, through rho(q), when compared to the calculation made from the 2 x 2 subspaces, if we use the usual definition rho(A(B)) = TrB(A)(rho), and then elevates the matrices to the qth power, as adopted in other contexts in the literature of the nonextensive statistics. On another hand, full agreement is found if we take rho(A(B),q) = TrB(A)(rho(q)), remaining q an implicit parameter. (C) 2004 Elsevier B.V. All rights reserved. 
publisher 
ELSEVIER SCIENCE BV 
issn 
03784371 
year published 
2004 
volume 
343 
beginning page 
499 
ending page 
504 
digital object identifier (doi) 
10.1016/j.physa.2004.05.074 
web of science category 
Physics, Multidisciplinary 
subject category 
Physics 
unique article identifier 
WOS:000224495900034

impact metrics
journal analysis (jcr 2019):

journal impact factor 
2.924 
5 year journal impact factor 
2.625 
category normalized journal impact factor percentile 
70 
dimensions (citation analysis):


altmetrics (social interaction):


