Electron and phonon interactions with two-level-tunneling systems in the high-Tc superconductor YBa2Cu3O7−δ and in niobium
M. J. McKenna, A. Hikata, J. Takeuchi, C. Elbaum, R. Kershaw, A. Wold
DOI 10.1103/PhysRevLett.62.1556 · Physical Review Letters
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Abstract
We have measured ultrasonic velocity changes with temperature (T≤1 K) to study two-level-tunneling systems (TLS) interactions with electrons and with phonons in the high-Tc superconductor YBa2Cu3O7−δ and in a niobium compact. In YBa2Cu3O7−δ, at T≪Tc, TLS relaxation is dominated by conduction electrons, as in normal metallic glasses. In niobium, at T≪Tc, this relaxation is dominated by phonons, as in other disordered, conventional superconductors. We also review recent specific-heat measurements in light of these results.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.97 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
| YBa2Cu3O6.97 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
| YBa2Cu3O6.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82 | Pressure not reported | onset |
| YBa2Cu3O6.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 82 | Pressure not reported | onset |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.5 | Pressure not reported | unknown |
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