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Author (up) Esquinazi, P.; Durán, C.; Fainstein, C.; Núñez Regueiro, M. url  doi
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  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  
  Keywords  
  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.  
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  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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