Phys Rev Lett. 2003 Sep 05;91(10):105501. doi: 10.1103/PhysRevLett.91.105501. Epub 2003 Sep 04.
Physical review letters
S Ludwig, D D Osheroff
PMID: 14525488 DOI: 10.1103/PhysRevLett.91.105501
In nonequilibrium experiments on the glasses Mylar and BK7, we measured the excess dielectric response after the temporary application of a strong electric bias field at millikelvin temperatures. A model recently developed describes the observed long time decays qualitatively for Mylar [Phys. Rev. Lett. 90, 105501(2003)]], but fails for BK7. In contrast, our results on both samples can be described by including an additional mechanism to the mentioned model with temperature independent decay times of the excess dielectric response. As the origin of this novel process beyond the "tunneling model" we suggest bias field induced structural rearrangements of "tunneling states" that decay by quantum mechanical tunneling.
