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Electron renormalization of sound interaction with two-level systems in superconducting metallic glasses

Bezuglyi, E. V. and Gaiduk, A. L. and Fil, V. D. and Zherlitsyn, S. and Johnson, W. L. and Bruls, G. and Lüthi, B. and Wolf, B. (2000) Electron renormalization of sound interaction with two-level systems in superconducting metallic glasses. Physical Review B, 62 (10). pp. 6656-6664. ISSN 0163-1829. doi:10.1103/PhysRevB.62.6656.

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The crossing of the temperature dependences 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’s) caused by their coupling with electrons. In this paper we examine different theoretical approaches to a quantitative description of the renormalization, using the results of a low-temperature ultrasonic investigation of Zr41.2Ti13.8Cu12.5Ni10Be22.5 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 the renormalization affecting only nearly symmetric TLS’s, which may be associated with the effect of electron density fluctuations on the interwell potential.

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Additional Information:©2000 The American Physical Society Received 3 January 2000 The authors thank G. Weiss for the fruitful discussion. This research was partially supported by the Ukrainian State Foundation for Fundamental Research (Grant No. 2.4/153) and the Deutsche Forschungsgemeinschaft via SFB 252. W.L.J. wishes to acknowledge the U. S. Dept. Of Energy for support under Grant No. DE-FG03-86ER45242. S.Z. would like to thank the Alexander von Humboldt Foundation for support.
Issue or Number:10
Record Number:CaltechAUTHORS:BEZprb00
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2186
Deposited By: Archive Administrator
Deposited On:13 Mar 2006
Last Modified:08 Nov 2021 19:45

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