Premium
On the SD Model for Coexistence of Ferromagnetism and Superconductivity
Author(s) -
Tonchev N. S.,
Brankov I. G.
Publication year - 1980
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221020114
Subject(s) - superconductivity , ferromagnetism , hamiltonian (control theory) , condensed matter physics , impurity , ground state , physics , zener diode , mixed phase , standard linear solid model , mathematical physics , phase (matter) , quantum mechanics , mathematics , thermodynamics , voltage , mathematical optimization , resistor , viscoelasticity
The Vonsovskii‐Zener model for a superconductor with regularly positioned magnetic impurities is considered. Two theorems are given which prove the exact solubility of the thermodynamic problem by the approximating Hamiltonian method. Exact analytical solutions for the zero‐temperature order parameters and the ground state energy of the mixed phase are derived. A comparison of the energies of the different phases confirms the known result that ferromagnetism and superconductivity cannot coexist in the ground state of the model.