Dr. habil. (Technische Uni Budapest) Rudolf Hackl

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Fakultät für Physik
Technische Physik
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Privatdozent am Physik-Department
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Raman-Streuung an Phononen in YBa2Cu3O6+x in der Nähe von Zwillingsgrenzen
Close to twin and grain boundaries the crystal lattice is expected to be strained. The strain fields extend over several unit cells. In some materials new properties such as superconductivity are found in this range which is intended to be scrutinized by confocal and tip-enhanced Raman spectroscopy. To this end the apex phonon of YBa2Cu3O6+x (c-axis vibration of the oxygen atoms above the CuO2 plane) will be studied in the vicinity of twin and grain boundaries using light scattering. If the local resolution of confocal Raman scattering is insufficient, the near field effect of metallic tips shall be exploited. Eventually, the tips have to be prepared freshly. 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
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 excitations 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, CA, USA. 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 von Magnetismus und Supraleitung in unterdotiertem YBa2Cu6O6+x
geeignet als
  • Masterarbeit Physik der kondensierten Materie
Themensteller(in): Rudolf Hackl
Untersuchung von Phononen in magnetisch entzwillingtem EuFe2As2
Phonons are quantized lattice vibrations that couple to basically all excitations in a solid. In iron-based compounds for instance, several phonons couple to the electronic structure which is modified by the stripe-like magnetic order at low temperature. This was studied successfully in BaFe2As2. As a caveat, these samples need to be de-twinned mechanically, and the necessary strain has also an impact on the phonons entangling the effects of strain and magnetic order. This problem can be overcome by using EuFe2As2 which can be de-twinned in moderate magnetic fields and then stays single-domain even after switching off the field. This facilitates a “clean” experiment which helps answering the question as to the driving force behind magnetism, structural distortions, and superconductivity in the iron-based compounds. It is planned to study the phonons of EuFe2As2 (Jannis Maiwald and Philipp Gegenwart, University of Augsburg) at various doping levels and compare the results to theoretical predictions. For the theory work there is a long-standing collaboration with theory groups in Frankfurt/Main and Washington, D.C., USA. The work includes an introduction to spectroscopy, low-temperature, and high-field techniques.
geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Hackl

Kondensierte Materie

Wenn Atome sich zusammen tun, wird es interessant: Grundlagenforschung an Festkörperelementen, Nanostrukturen und neuen Materialien mit überraschenden Eigenschaften treffen auf innovative Anwendungen.

Kern-, Teilchen-, Astrophysik

Ziel der Forschung ist das Verständnis unserer Welt auf subatomarem Niveau, von den Atomkernen im Zentrum der Atome bis hin zu den elementarsten Bausteinen unserer Welt.

Biophysik

Biologische Systeme, vom Protein bis hin zu lebenden Zellen und deren Verbänden, gehorchen physikalischen Prinzipien. Unser Forschungsbereich Biophysik ist deutschlandweit einer der größten Zusammenschlüsse in diesem Bereich.