Dynamics of the Destruction and Rebuilding of a Dipole Gap in Glasses

Details Dynamics of the Destruction and Rebuilding of a Dipole Gap in Glasses Dynamics of the Destruction and Rebuilding of a Dipole Gap in Glasses

2002-12-08

arxiv.org/abs/cond-mat/0212164v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.90.105501

After a strong electric bias field was applied to a glass sample at temperatures in the millikelvin range its AC-dielectric constant increases and then decays logarithmically with time. For the polyester glass mylar we have observed the relaxation of the dielectric constant back to its initial value for several temperatures and histories of the bias field. Starting from the dipole gap theory we have developed a model suggesting that the change of the dielectric constant after transient application of a bias field is only partly due to relaxational processes. In addition, non-adiabatic driving of tunneling states (TSs) by applied electric fields causes long lasting changes in the dielectric constant. Moreover, our observations indicate that at temperatures below 50 mK the relaxation of TSs is caused primarily by interactions between TSs.

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