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Author Núñez Regueiro, M.; Esquinazi, P.; Izbizky, M.A.; Duran, C.; Castello, D.; Luzuriaga, J.; Nieva, G. url  doi
  Title Evidence of tunneling systems through thermal and acoustic measurements in ceramic materials Type Journal Article
  Year 1988 Publication Physica C: Superconductivity and its applications Abbreviated Journal Physica C  
  Volume 153-155 Issue (up) PART 2 Pages 1016-1017  
  Keywords Acoustic Variables Measurement--Wave Velocity; Ceramic Materials--Thermal Conductivity; Europium Barium Copper Oxides; Superconducting Materials  
  Abstract We have neasured the sound velocity, internal friction, thermal conductivity and specific heat of La-based and (Y/Eu)- based ceramics. The low temperature data can be understood in terms of the Tunneling Model assuming the existence of Tunneling Systems (TS). From these measured properties we obtain values for the parameter C=P?2/?v2, where P is the density of states of TS, ? the coupling constant between phonons and TS, ? the mass density and v the sound velocity close to those obtained for amorphous and “orientational” disordered crystalline materials. Our data would indicate that the TS are intrinsic defects independent of the sample porosity.  
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  ISSN 09214534 (ISSN) ISBN Medium  
  Area Expedition Conference International Conference on High Temperature Superconductors and Materials and Mechanisms of Superconductivity  
  Notes Export Date: 28 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: Regueiro, M.N.; Centro At Approved no  
  Call Number BT @ luzuriag @ Serial 496  
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