caa a22 4500 445382694 CHVBK 20180317143022.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10948-010-0927-1 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0927-1 Coexistence of Superconductivity and Itinerant Ferromagnetism in Ferromagnetic Metals UCoGe and UIr [Elektronische Daten] [Subhra Kakani, K. Pancholi, S. Kakani] A 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 C,T FM), where T C and T FM 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. Springer Science+Business Media, LLC, 2010 Green's function nationallicence Itinerant ferromagnetism nationallicence Hubbard Hamiltonian nationallicence BCS Hamiltonian nationallicence Density of states nationallicence Kakani Subhra Department of Physics, MLV Government College, 311001, Bhilwara, Rajasthan, India aut Pancholi K. Department of Physics, MLV Government College, 311001, Bhilwara, Rajasthan, India aut Kakani S. Institute of Technology & Management, NH. No. 79, Bhilwara By- Pass Chittor Road, Bhilwara, Rajasthan, India aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1527-1545 1557-1939 24:5<1527 2011 24 10948 https://doi.org/10.1007/s10948-010-0927-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0927-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kakani Subhra Department of Physics, MLV Government College, 311001, Bhilwara, Rajasthan, India aut NATIONALLICENCE 700 1- Pancholi K. Department of Physics, MLV Government College, 311001, Bhilwara, Rajasthan, India aut NATIONALLICENCE 700 1- Kakani S. Institute of Technology & Management, NH. No. 79, Bhilwara By- Pass Chittor Road, Bhilwara, Rajasthan, India aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1527-1545 1557-1939 24:5<1527 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer