Evidence for a Second Order Phase Transition in Glasses at Very Low Temperatures -- A Macroscopic Quantum State of Tunneling Systems
Disordered Systems and Neural Networks
2009-10-30 v1
Abstract
Dielectric measurements at very low temperature indicate that in a glass with the eutectic composition BaO-AlO-SiO a phase transition occurs at 5.84 mK. Below that temperature small magnetic fields of the order of 10 T cause noticeable changes of the dielectric constant although the glass is insensitive to fields up to 20 T above 10 mK. The experimental findings may be interpreted as the signature of the formation of a new phase in which many tunneling systems perform a coherent motion resulting in a macroscopic wave function.
Keywords
Cite
@article{arxiv.cond-mat/9712325,
title = {Evidence for a Second Order Phase Transition in Glasses at Very Low Temperatures -- A Macroscopic Quantum State of Tunneling Systems},
author = {P. Strehlow and C. Enss and S. Hunklinger},
journal= {arXiv preprint arXiv:cond-mat/9712325},
year = {2009}
}
Comments
4 pages, 4 figures, submitted to Phys. Rev. Lett