Theoretical Study of Interplay of Superconductivity and Ferromagnetism in Hybrid Rutheno–Cuprate Superconductors RuSr2RCu2O8 |
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| Authors: | R S Meghwal T C Loya S L Kakani |
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| Affiliation: | (1) Department of Physics, Government College, Kota, 324001, Rajasthan, India;(2) Department of Pure and Applied Physics, University of Kota, Kota, 324005, Rajasthan, India;(3) Institute of Technology and Management, NH 79, Chitlor Road, Bhilwara By-pass, Bhilwara, 311001, Rajasthan, India |
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| Abstract: | We consider the extended two-band s–f model with additional terms, describing intersite Cooper pairs’ interaction between
4f (5f) and conduction electrons. Following Green’s function technique and equation of motion method, self-consistent equations
for superconducting order parameter (Δ) and magnetic order parameter (m
f
) are derived. The expressions for specific heat, density of states, and free energy are also derived. The theory has been
applied to explain the coexistence of superconductivity and ferromagnetism in hybrid rutheno-cuprate superconductors RuSr2RECu2O8 (RE = Gd, Eu). The theory shows that it is possible to become superconducting if the system is already ferromagnetic. A study
of specific heat, density of states and free energy is also presented. The agreement between theory and experimental observations
is quite satisfactory.
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| Keywords: | Ferromagnetic superconductors Green’ s functions Two-band extended model Exchange interaction Phase transition |
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