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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 |
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| 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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