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Author (up) Esquinazi, P.; Durán, C.; Fainstein, C.; Núñez Regueiro, M. url  doi
  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  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ 10.1103/PhysRevB.37.545 Serial 576  
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