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On the phase coexistence of band ferromagnetism and singlet superconductivity

F. MOSCALU1,*

Affiliation

  1. ”Ovidius” University, Constanţa, 900527, Romania

Abstract

In this work we evaluate the conditions of the superconductivity -band ferromagnetism coexistence using a Green Zubarev function method for a singlet Cooper pairing system, where the ferromagnetic order appears as a consequence of spontaneously broken spin-rotation symmetry. In this way, we get the solutions for the Green functions and the elementary excitations spectrum of the interacting system. Using a spectral representation for the correlation functions, the self consistent equations for the order parameters are derived and their solutions at 0=T K are discussed. For this case, the relations between ferromagnetic and singlet pairing constants are emphasized. Finally the energy of the system in this state is calculated and we show that the singlet superconductivity-band ferromagnetism phase coexistence is more favorable energetically than the normal phase..

Keywords

Ferromagnetism, Superconductivity, Strongly correlated electrons.

Submitted at: June 26, 2006
Accepted at: Sept. 13, 2006

Citation

F. MOSCALU, On the phase coexistence of band ferromagnetism and singlet superconductivity, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 5, pp. 1851-1855 (2006)