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- Title
Coexistence of Superconductivity and Itinerant Ferromagnetism in Ferromagnetic Metals UCoGe and UIr.
- Authors
Kakani, Subhra; Pancholi, K.; Kakani, S.
- Abstract
microscopic coexistence of itinerant ferromagnetism (FM) and superconductivity (SC) is studied in a single band homogenous system, following an equation of motion method and Green's function technique. Self-consistent equations for superconducting order parameter (Δ) and magnetization parameter ( M) are derived. It is shown that there generally exists a coexistent (Δ≠0, M≠0) solution to the coupled equations of the order parameters in the temperature range 0< T<min ( T, T), where T and T are respectively the superconducting and ferromagnetic transition temperatures. The expressions for electronic specific heat ( C/ T), density of states, free energy, transition probabilities, ultrasonic attenuation, and nuclear relaxation are also derived. The theory is applied to explain the observations in UCoGe and UIr. The specific heat capacity at low temperature shows linear temperature dependence as opposed to the activated behavior. Density of states increases as opposed to the case of a standard ferromagnetic metal. Free energy study reveals that the superconducting ferromagnetic state has lower energy than the normal ferromagnetic state and, therefore, coexistence of FM and SC realized at a low enough temperature. The agreement between theory and experimental results for UCoGe and UIr is quite encouraging.
- Subjects
FERROMAGNETISM; SUPERCONDUCTIVITY; GREEN'S functions; DIFFERENTIAL equations; TRANSITION temperature; MAGNETIZATION
- Publication
Journal of Superconductivity & Novel Magnetism, 2011, Vol 24, Issue 5, p1527
- ISSN
1557-1939
- Publication type
Article
- DOI
10.1007/s10948-010-0927-1