Investigations of strongly correlated materials by application of high pressure
Event details
| Date | 27.02.2015 |
| Hour | 14:15 |
| Speaker | Dr. Vasily Potapkin, Jülich Centre for Neutron Science JCNS und Peter Grünberg Institut PGI |
| Location | |
| Category | Conferences - Seminars |
Strongly correlated materials are systems where correlations betweensuperconductors, Mott insulators, spintronic materials, ferroelectrics, heavy fermion materials etc. are examples of strongly correlated matter.
Here I would like to show that application of pressure is one of the most useful ways to study the nature of the magnetic state of strongly correlated matter in general and insulator to metal transition (a.k.a. Mott transitions) in them in particular, since the balance between Coulomb and kinetic energy can be tuned directly. Such investigations are important for understanding of the fundamental nature of magnetism in solids and also for explanation of newly discovered effects like superconductivity, as tight interconnection between Mott transitions and the emergency of superconductivity was repeatedly reported in a literature [1,2].
As examples I will primarily use the results on NiO that is considered as one of the most important compounds for the field of strongly correlated materials due to two reasons: firstly, as it was treated as a prototypical Mott insulator by N.F. Mott and co-workers[3]; secondly, because it is chemically one of the simplest compounds that is ideally suited to be a model system to test and verify theoretical predictions and models. As well as couple of other systems.
References:
[1] M.-S. Nam, A. Ardavan, S. J. Blundell, and J. A. Schlueter, Nature 449, 584 (2007).
[2] P. Durand, G. R. Darling, Y. Dubitsky, A. Zaopo, and M. J. Rosseinsky, Nat Mater 2, 605 (2003).
[3] S. N F Mott, Metal-Insulator Transitions, 2nd Edition (Taylor & Francis, 1990).
Here I would like to show that application of pressure is one of the most useful ways to study the nature of the magnetic state of strongly correlated matter in general and insulator to metal transition (a.k.a. Mott transitions) in them in particular, since the balance between Coulomb and kinetic energy can be tuned directly. Such investigations are important for understanding of the fundamental nature of magnetism in solids and also for explanation of newly discovered effects like superconductivity, as tight interconnection between Mott transitions and the emergency of superconductivity was repeatedly reported in a literature [1,2].
As examples I will primarily use the results on NiO that is considered as one of the most important compounds for the field of strongly correlated materials due to two reasons: firstly, as it was treated as a prototypical Mott insulator by N.F. Mott and co-workers[3]; secondly, because it is chemically one of the simplest compounds that is ideally suited to be a model system to test and verify theoretical predictions and models. As well as couple of other systems.
References:
[1] M.-S. Nam, A. Ardavan, S. J. Blundell, and J. A. Schlueter, Nature 449, 584 (2007).
[2] P. Durand, G. R. Darling, Y. Dubitsky, A. Zaopo, and M. J. Rosseinsky, Nat Mater 2, 605 (2003).
[3] S. N F Mott, Metal-Insulator Transitions, 2nd Edition (Taylor & Francis, 1990).
Practical information
- Informed public
- Free
Organizer
- ICMP (Arnaud Magrez and Raphaël Butté)
Contact
- Arnaud Magrez ([email protected])