Magnetic and Superconducting Properties of ZrZn2 from Ab-initio Electronic Structure Calculations

 

Dr. Gilles Santi

University of Bristol, United Kingdom

 

The interplay between magnetism and superconductivity has been of great

interest since the advent of the BCS theory. In this conventional picture, ferromagnetism, acting as a breaker of the Cooper pairs, is very detrimental to superconductivity. The very recent observation of the coexistence of ferromagnetism and superconductivity in ZrZn2 has led to a re-evaluation of the conventional (electron-phonon) BCS scenario. I will discuss the ferromagnetic and superconducting properties of ZrZn2 in the framework of ab-initio electronic structure calculations. In particular, I will show that, despite a large conventional BCS-like electron-phonon coupling, the ferromagnetic) spin-fluctuations dominate and can account for spin-triplet

p-wave superconductivity in this material.