TY  - GEN
N2  - This thesis investigates the influence of nuclear moments on the decay of dielectric two-pulse polarization echoes in glasses at low temperatures based on twelve samples. 
Several samples, containing atoms carrying nuclear moments, show a very fast decay of the echo amplitude at short times, which can be attributed to a nuclear moment based relaxation. A detailed comparison of all decay curves shows, that the modulation of the quadrupole coupling constant during the tunneling motion is the decisive parameter for a significant contribution of a nuclear moment based relaxation. 
For the glass HY-1, the additional Zeeman splitting in a magnetic field reduces the influence of the nuclear moment based relaxation on the decay of the echo amplitude, as expected. 
The observed decay behavior cannot be described by current theoretical models, indicating another relaxation mechanism related to the relaxation due to nuclear moments.
To further study the decay at very short pulse separation times, a novel setup, based on planar microfabricated superconducting resonators, was developed. This enabled for the first time pulse separation times close to the theoretical limit and the observation of the Gaussian shape like leveling-off of the echo amplitude of 
N-BK7 glass, as predicted by spectral diffusion theory.
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/30293/
A1  - Schaller, Andreas
ID  - heidok30293
Y1  - 2021///
TI  - Influence of nuclear moments on the decay of dielectric polarization echoes in glasses at low temperatures
CY  - Heidelberg
AV  - public
ER  -