@bachelorsthesis{1994V,
  title={Thin-film high-Tc superconductors},
  author={Wolfgang Volz},
  month={February},
  year={1994},
  abstract={The magnetoresistance of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub>
- PrBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub>
(YBCO-PrBCO) superlattices is studied in the vicinity of the transition
temperature in magnetic fields perpendicular to the a-b plane up to 5.5
Tesla. For the 7YBCOx7PrBCO and the 7YBCOx14PrBCO superlattice we get an excellent
fitting according to the Larkin 2-D superconducting fluctuation theory.
We relate this behavior to a complete interlayer decoupling between the
YBCO layers. Because of the equal thickness of the YBCO layers for both
samples, we obtained for the fluctuation amplitude, the fluctuating sheet
resistance and the critical temperature of the quasi two-dimensional
superconducting layer almost the same results for both superlattices.
One of the two fit parameters, H<sub>phi</sub>(T), is consistent for both samples
with the theoretical prediction of Reizer for the quasi two dimensional
electron-electron interaction.
Additionally, we found that the resistivities for rho -> rho<sub>0</sub> are not
caused directly by fluctuations, but rather is related to thermally
assisted flux creep.},
  note={Supervised by F.S. Razavi}
}