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Dr. habil. (Technische Uni Budapest) Rudolf Hackl

+49 89 289 14218
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Technische Physik
Fakultät für Physik
Privatdozent am Physik-Department
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Lehrveranstaltungen und Termine

Ausgeschriebene Angebote für Abschlussarbeiten

STM- und Raman-Untersuchungen von Korn- und Zwillingsgrenzen
The in situ combination of different experimental methods provides better access to complex properties. Here, the topography of a surface shall be explored by scanning tunneling microscopy (STM) and can be directly compared with the spectroscopic information from inelastic light scattering, for example lattice vibrations. Using near-field techniques the two types of information can be obtained from the same location and compared. In this way, lattice distortions and the related strain fields close to twin or grain boundaries can be studied.
geeignet als
  • Bachelorarbeit Physik
Themensteller(in): Rudolf Hackl
Tunnel- und Raman-Spektroskopie an Kuprat-Supraleitern
In superconductors on CuO2 basis (cuprates) the fundamental questions as to the relevant energy scales such as the gap in the superconducting state or the pseudo-gap above the superconducting transition temperature Tc as well as their interrelation remain a tantalizing open problem. This is highlighted by the discrepancies between the different types of spectroscopies sensitive to electronic properties such as photoemission, tunneling, infrared of Raman spectroscopy. Tunneling spectroscopy has enough resolution to demonstrate the spatial variation of the energy scales. Raman spectroscopy shows a dependence of the energy scales on impurities and strain. For addressing this problem it is intended to study tunneling and Raman spectra at the identical location of selected samples and to analyze the data simultaneously. The analysis will be performed in collaboration with theorists at Stanford University. The work includes a thorough introduction to spectroscopy as well as low-temperature and ultra-high vacuum (UHV) methods.
geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Hackl
Untersuchung der Energieskalen von Kupratsupraleitern als Funktion des externen Drucks
Superconductors on CuO2 basis (cuprates) are characterized by a plethora of phases and instabilities including superconductivity. Their interrelation is considered crucial for understanding the material class, in particular high-Tc superconductivity. For accessing the various phases one usually varies the doping but, concomitantly, the crystal and /or defect structure changes. Alternatively, the doping level can be varied using hydrostatic pressure allowing one to use the very same sample for at least a limited doping range. The related volume change is considered less problematic. It is intended to study the relevant energy scales of the accessible phases by inelastic light (Raman) scattering in a diamond anvil cell (DAC). The pressure range of our DAC is approximately 20 GPa being sufficient for all cuprates. During the Master’s thesis appropriately doped samples shall be prepared using a tested annealing protocol. The samples have to be mounted in the DAC and studied via Raman scattering at various applied pressure values. The work includes a thorough introduction to the physics of the cuprates, as well as spectroscopy, low-temperature, and high-pressure methods.
geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Hackl
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