Dipl.-Phys. Christopher Duvinage
Ausgeschriebene Angebote für Abschlussarbeiten
- Kalorimetrie von Quanten-Phasen-Übergängen im Transversalen Magnetfeld
In materials with strong magnetic anisotropies, long-range magnetic order can be destroyed with a magnetic field applied along the hard magnetisation axis. At ultra-low temperatures in the milli-Kelvin range this suppression entails the perhaps theoretically best understood examples of a quantum phase transition, i.e., a phase transition driven by a change of quantum entanglement.
Even though the specific heat represents the most important thermodynamic probe of the nature of the excitations of a given material, measurements across transverse field tuned quantum phase transitions, despite many decades of research, have not been reported in the literature, because the presence of strong magnetic torques limit the thermal decoupling from the bath.
The objective of the thesis project are measurements of the specific heat in materials with strong electronic correlations and large magnetic anisotropies under magnetic fields applied along the hard magnetisation axis. An experimental device capable of performing the necessary measurements was recently developed and commissioned by our group. It is world-wide unique, permitting for the first time the required measurements. The experiments comprise of highly sophisticated experimental techniques and the theoretical interpretation based on quantum field theoretical concepts.
- geeignet als
- Masterarbeit Physik der kondensierten Materie
- Masterarbeit Applied and Engineering Physics
- Themensteller(in): Christian Pfleiderer