Theoretical Study of Interplay Between Superconductivity and Itinerant Ferromagnetism
Journal Title: Journal of Nuclear Physics, Material Sciences, Radiation and Applications - Year 2014, Vol 2, Issue 1
Abstract
Following Green’s function technique and equation of motion method, the coexistence of superconductivity (SC) and itinerant ferromagnetism (FM) is investigated in a single band homogenous system. Self-consistent equations for SC and FM order parameters, Δ and m or I respectively am derived. It is shown that there generally exists a coexistent (Δ ≠ 0, and m or I ≠ 0) solutions to the coupled equations of the order parameter in the temperature range 0 < T < min(TC, TFM), where TC and TFM are respectively the superconducting and ferromagnetic transition temperatures. Expressions for specific heat, the density of states, free energy, and critical field are derived. The specific heat has linear temperature dependence as opposed to the exponential decrease in the BCS theory. The density of states for a finite m increases as opposed to that of a ferromagnetic metal. Free energy study reveals that FMSC state has the lowest energy than the normal FM state and therefore realized at low enough temperature. Effect of the small external field is also studied. The theory is applied to explain the observations in uranium-based intermetallics systems UCoGe and UIr. The agreement between theory and experiments is quite encouraging.
Authors and Affiliations
Subhra Kakani, Anuj Nuwal, S. L. Kakani
Keywords
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- EP ID EP593521
- DOI 10.15415/jnp.2014.21004
- Views 242
- Downloads 0
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