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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Statistical thermodynamics of the Frohlich-Bose-Einstein condensation of magnons out of equilibrium

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Vannucchi, Fabio Stucchi [1] ; Luzzi, Roberto [2]
Total Authors: 2
[1] Sao Paulo State Univ UNESP, Inst Biosci, BR-11380972 Sao Vicente, SP - Brazil
[2] State Univ Campinas UNICAMP, Inst Phys Gleb Wataghin, Condensed Matter Phys Dept, BR-13083859 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Physical Review E; v. 100, n. 3 SEP 18 2019.
Web of Science Citations: 0

This work presents a nonequilibrium statistical-thermodynamic approach to the study of a Frohlich-Bose-Einstein condensation of magnons under radio-frequency radiation pumping. Frohlich-Bose-Einstein condensates display a complex behavior consisting in steady-state conditions to the emergence of a synergetic dissipative structure resembling the Bose-Einstein condensation of systems in equilibrium. Then a kind of ``two-fluid model{''} arises: the ``normal{''} nonequilibrium structure and the Frohlich condensate, which is shown to be an attractor to the system. In this study we analyze some aspects of the irreversible thermodynamics of this dissipative complex system. We obtained the expression for the informational entropy of the two-fluid condensate and introduced an order parameter to characterize the role of the Frohlich interaction in ordering the system. The analysis highlights the order increase due to the Frohlich interaction. We also study the informational entropy production of the system, considering its internal and external parts. Finally, the Glansdorff-Prigogine criteria for evolution and (in) stability are verified. (AU)

FAPESP's process: 11/14341-9 - Non-Equilibrium Statistical Thermodynamics of Excited Magnons
Grantee:Fabio Stucchi Vannucchi
Support type: Scholarships in Brazil - Post-Doctorate