| Popis: |
Coexistence of Superconductivity and magnetism have always been the fascinating area of interest for condensed-matter physicists. A variety of systems, such as cuprates, heavy fermions, and iron pnictides showed superconductivity in a narrow region near the border to antiferromagnetism (AFM)as a function of pressure or doping. However, the coexistence of superconductivity and ferromagnetism (FM) has seen in URhGe, UGe2, ErRh4B4 and many compounds. Here, we present a third situation where superconductivity coexists with FM and AFM. The recent experimental finding of interplay of ferromagnetism,antiferromagnetism and superconductivity in EuFe2(As1-xPx)2 impressed us to discuss this problem in detail. Ironpnictides are high Tc magnetic superconductors and could be very useful in finding many new superconductorswith high Tc probably near to room temperature. In this paper, we have theoretically calculated the superconducting order parameter of EuFe2(As1-xPx)2 where magnetic ordering is due to Eu+ moments and superconductivity is due to Fe3+ moments. The Eu ions order antiferromagnetically for x≤0.13, while a crossover is observed for x≥0.22 whereupon the Eu ions order ferromagnetically. |
