Evidence of low-energy tunneling excitations in the high-Tc superconductor YBa2Cu3O7x

P. Esquinazi, C. Durán, C. Fainstein, and M. Núñez Regueiro
Phys. Rev. B 37, 545 – Published 1 January 1988
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Abstract

We have measured the internal friction Q1 and the Young's-modulus sound velocity vE at 1 kHz for YBa2Cu3O7x. Below 20 K the relative change in the sound velocity and the temperature dependence of the internal friction perfectly resemble the behavior obtained for Suprasil W. Below 1 K we observe a logarithmic temperature dependence for the sound velocity and between 1 and 5 K a well-defined plateau in the internal friction is obtained. We find quantitative agreement with the predictions of the standard tunneling model which is widely used to explain the low-temperature properties of amorphous materials. The implications of the existence of tunneling systems in these materials are discussed.

  • Received 21 August 1987

DOI:https://doi.org/10.1103/PhysRevB.37.545

©1988 American Physical Society

Authors & Affiliations

P. Esquinazi, C. Durán, C. Fainstein, and M. Núñez Regueiro

  • Centro Atómico Bariloche, 8400 Bariloche, Rio Negro, Argentina

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Vol. 37, Iss. 1 — 1 January 1988

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