Superconducting transition temperature in heterogeneous ferromagnet-superconductor systems
Abstract
We study the superconducting phase transition in two systems: ferromagnet-superconductor bilayer (FSB) and a thin superconducting film with a periodic array of magnetic dots (SFMD) upon it. We show that this transition is of the first order in FSB and of the second order in SFMD. The shift of the transition temperature ΔTc due to the presence of a ferromagnetic layer may be positive or negative in the FSB and is always negative in the SFMD. The dependence of ΔTc on geometrical factors and external magnetic field is found. Theory is extended to multilayers.
- Publication:
-
Physical Review B
- Pub Date:
- March 2004
- DOI:
- 10.1103/PhysRevB.69.104530
- arXiv:
- arXiv:cond-mat/0305153
- Bibcode:
- 2004PhRvB..69j4530P
- Keywords:
-
- 74.62.-c;
- 74.78.-w;
- 74.78.Fk;
- 75.70.Ak;
- Transition temperature variations;
- Superconducting films and low-dimensional structures;
- Multilayers superlattices heterostructures;
- Magnetic properties of monolayers and thin films;
- Condensed Matter - Superconductivity
- E-Print:
- 9 pages, 2 figures