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Núñez Regueiro, M.; Esquinazi, P.; Izbizky, M.A.; Durán, C.; Castello, D.; Luzuriaga, J. |
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Title |
Tunneling systems in high temperature superconductors |
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Journal Article |
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Year |
1988 |
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Annales de Physique |
Abbreviated Journal |
Ann. Phys. Fr. |
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13 |
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5 |
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401-406 |
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Keywords |
acoustic wave absorption; acoustic wave velocity; barium compounds; high temperature superconductors; lanthanum compounds; rare earth compounds; strontium compounds; superconductive tunnelling; thermal conductivity of solids; tunnelling systems; high temperature superconductors; thermal conductivity; sound attenuation; sound velocity; model; low temperature specific heat; La Sr Cu O |
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Abstract |
We have measured the thermal conductivity, sound attenuation and relative variation of sound velocity of compounds of the La-Sr-Cu-O and RBa2Cu3O7 families, where R is a rare-earth. We have found that all these properties can be quantitatively correlated within a tunneling system model similar to that used in amorphous materials. This interpretation would naturally explain the anomalous linear term of the low temperature specific heat observed in these materials. |
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0003-4169 |
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ISI:A1988Q715000009 |
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BT @ hernan @ |
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264 |
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Author |
Núñez Regueiro, M.; Esquinazi, P.; Izbizky, M.A.; Duran, C.; Castello, D.; Luzuriaga, J.; Nieva, G. |
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Title |
Evidence of tunneling systems through thermal and acoustic measurements in ceramic materials |
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Journal Article |
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Year |
1988 |
Publication |
Physica C: Superconductivity and its applications |
Abbreviated Journal |
Physica C |
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153-155 |
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PART 2 |
Pages |
1016-1017 |
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Acoustic Variables Measurement--Wave Velocity; Ceramic Materials--Thermal Conductivity; Europium Barium Copper Oxides; Superconducting Materials |
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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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09214534 (ISSN) |
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International Conference on High Temperature Superconductors and Materials and Mechanisms of Superconductivity |
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Notes |
Export Date: 28 April 2009; Source: Scopus; CODEN: PHYCE; Language of Original Document: English; Correspondence Address: Regueiro, M.N.; Centro At |
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BT @ luzuriag @ |
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496 |
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