Vortex dynamics in strong pinning theory

Seminar
QUEST Center event
No
Speaker
Vadim Geshkenbein, ETH, Zurich, Switzerland
Date
25/12/2017 - 17:00Add to Calendar 2017-12-25 17:00:00 2017-12-25 17:00:00 Vortex dynamics in strong pinning theory Magnetic field penetrates into a superconducting material  via topological defect lines, vortices. Electric and magnetic properties of  superconductors in a so called mixed state is determined by properties of ``Vortex matter".  This vortex matter is pushed by the transport current  and its motion induces an electric field and thus dissipation. It is pinning of vortices by material defects that recovers most valuable property of dissipation free current in superconductors. I review recent applications of strong pinning theory for vortex dynamics.  We derive linear current voltage characteristic above depinning which resembles the Coulomb’s law of dry friction. We consider effect of thermal fluctuations (flux creep) and ac response in the mixed state.   Physics (Building 202), Room 301 המחלקה לפיזיקה physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Physics (Building 202), Room 301
Abstract

Magnetic field penetrates into a superconducting material  via topological defect lines, vortices. Electric and magnetic properties of  superconductors in a so called mixed state is determined by properties of ``Vortex matter".  This vortex matter is pushed by the transport current  and its motion induces an electric field and thus dissipation. It is pinning of vortices by material defects that recovers most valuable property of dissipation free current in superconductors. I review recent applications of strong pinning theory for vortex dynamics.  We derive linear current voltage characteristic above depinning which resembles the Coulomb’s law of dry friction. We consider effect of thermal fluctuations (flux creep) and ac response in the mixed state.

 

תאריך עדכון אחרון : 24/12/2017