Abstract

In correlated materials, charge, spin, orbital and lattice degrees of freedom result in competing interactions. These lead to phase transitions and the emergence of exotic phases including; superconductivity, charge density waves (CDW) in layered dichalcogenides, spin density waves (SDW) in iron pnictide, pseudogap state in cuprates and manganites, and even phase separation in some high temperature superconductors. This can be tuned by charge doping, pressure, and magnetic field. However since the discovery of superconductivity on 1911 in Leiden, there is no full understanding of the superconducting mechanism in the unconventional superconductivity. Superconductivity remains mostly unsolved and emerges when the spin-density wave/charge density wave order is suppressed by doping, intercalation, or by external pressure. Our research is focused on the unconventional superconductivity in several correlated and novel materials. We investigated various fundamental problems for instance, the coexistence and competition between different phases; pairing symmetry and mechanism by transport, upper critical field, and thermodynamic measurements. Our results shed light to the understanding of the nature of unconventional superconductivity in quasi-two dimensional superconductors. On the other hand, room temperature superconductivity is still a dream to the world; however we are working on this dream.

 

 

About the Speaker

Dr Mahmoud Abdel-Hafiez was awarded PhD degree in physics from Institute of solid state physics, IFW, Dresden University, Germany in 2012. He worked as Postdoc researcher in Dresden from 2012 to 2013. Then he joined the group of Profs Moshchalkov and Silhanek at the Universities of Leuven and Liege in Belgium from 03/2013 to 03/2014. From March 2014, he works as staff scientist at the HPSTAR in China. In addition, from October 2015 till today he got a private job (Eigene Stelle) at the Goethe University Frankfurt, Germany. His research is focused on the study of unconventional superconductivity in strongly correlated material. He has published over 50 high-profile peer-reviewed papers including Nature Materials, Nature communication, PRB, PRL, Inorganic Chemistry, etc. His scientific work is highly cited up to 690 with H-index 15.