Inside vortex cores
Argonne Physicist Alexei E. Koshelev (MSD) and Former Postdoctoral Researcher Vivek Mishra (previously MSD – currently an Oak Ridge Affiliate Researcher) are studying the structure of an isolated superconducting vortex near a Spin-density-wave (SDW) instability inside a superconducting dome.
The researchers seek to understand how the SDW and superconducting phases interact with each other in iron-based superconductors which may help to understand what triggers superconductivity in these materials with such high transition temperatures. The research has been published in the journal Physical Review B.
Coexistence of antiferromagnetic order with superconductivity in many families of newly discovered iron-based superconductors has renewed interest to this old problem. Due to competition between the two types of order, one can expect appearance of the anti-ferromagnetism inside the cores of the vortices generated by the external magnetic field. The structure of a vortex in type II superconductors holds significant importance from the theoretical and the application points of view.
Here we consider the internal vortex structure in a two-band s± superconductor near a spin-density-wave instability. We treat the problem in a completely self-consistent manner within the quasiclassical Eilenberger formalism. We study the structure of the s± superconducting order and magnetic field-induced spin-density-wave order near an isolated vortex. We examine the effect of this spin-density-wave state inside the vortex cores on the local density of states.
Alexei E. Koshelev and Vivek Mishra, “Local Spin-density-wave Order Inside Vortex Cores in Multi-band Superconductors,” Physical Review B 92, 064511, (2015). DOI: 10.1103/PhysRevB.92.064511. Published Online August 13, 2015.