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Author Esquinazi, P.; Durán, C.; Fainstein, C.; Núñez Regueiro, M.
Title Evidence of low-energy tunneling excitations in the high-Tc superconductor YBa2Cu3O7-x Type Journal Article
Year 1988 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 37 Issue 1 Pages 545-547
Abstract We have measured the internal friction Q-1 and the Young's-modulus sound velocity vE at 1 kHz for YBa2Cu3O7-x. 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.
Corporate Author Thesis
Publisher American Physical Society Place of Publication Editor
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Notes Approved no
Call Number BT @ pedrazp @ 10.1103/PhysRevB.37.545 Serial 576
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