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Research Abstracts Online
January 2008 - March 2009

University of Minnesota Twin Cities
Institute of Technology
School of Physics and Astronomy
Department of Physics

PI: Oriol T. Valls, Fellow

Numerical Studies on Superconducting/Magnetic Structures and on the Superconducting Vortex Lattice Phase Diagram

These researchers continued their investigations into two areas: proximity effects in heterostructures involving superconductors and ferromagnets, and phase diagram and density structure of superconducting vortex systems in the presence of pinning centers. In the first area, the group studies the behavior of high-quality multilayers and superlattices composed of superconducting and ferromagnetic materials, using a numerical method they have developed to solve the exact microscopic equations for such systems. In the second area, the researchers study the phase diagram of type II superconductors in the vortex state, in the presence of both a magnetic field and pinning centers. They use numerical minimization of the appropriate free energy function (in terms of the time-averaged density variables) to find the free energy from which the phase diagram is obtained. The density structure at each minimum yields the correlation functions and the nature (crystal, glass, or liquid) of the phase.

Group Members

Paul Barsic, Graduate Student
Klaus Halterman, China Lake Research Center, China Lake, California
Igor Zutic, State University of New York, Buffalo, New York