The critical magnetic field of a superconductor with 4-fermion attraction weakly perturbed by magnetic impurities

✍ Scribed by D. Borycki; Jan Maćkowiak

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 207 KB
• Volume: 470
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2009.11.112

✦ Synopsis

The Hamiltonian of a superconductor with 4-fermion attraction is modified by adding a long-range magnetic interaction V between conduction fermions and localized spin 1/2 magnetic impurities. V has the form of a reduced s-d interaction. Using an asymptotic form of the system's free energy f(H,b) and the resulting mean-field equations for the gap D and a parameter y, characterizing the impurity subsystem obtained in [1], we derive the expression for the critical magnetic field. At sufficiently low temperatures the critical field is found to increase with decreasing temperature, similarly as in some antiferromagnetic superconductors.