Electron renormalization of sound interaction with two-level systems in superconducting metglasses
Abstract
The crossing of temperature dependencies of sound velocity in the normal and the superconducting state of metallic glasses indicates renormalization of the intensity of sound interaction with two-level systems (TLS) caused by their coupling with electrons. In this paper we have analyzed different approaches to a quantitative description of renormalization using the results of low-temperature ultrasonic investigation of ZrTiCuNiBe amorphous alloy. It is shown that the adiabatic renormalization of the coherent tunneling amplitude can explain only part of the whole effect observed in the experiment. There exists another mechanism of renormalization affecting only nearly symmetric TLS.
Keywords
Cite
@article{arxiv.cond-mat/9912474,
title = {Electron renormalization of sound interaction with two-level systems in superconducting metglasses},
author = {E. V. Bezuglyi and A. L. Gaiduk and V. D. Fil and S. V. Zherlitsyn and W. L. Johnson and G. Bruls and B. Luethi and B. Wolf},
journal= {arXiv preprint arXiv:cond-mat/9912474},
year = {2009}
}
Comments
10 pages, LaTeX, 6 Postscript figures, submitted to Phys. Rev. B