Ultrasonic studies of the relation between two-level-tunneling systems, oxygen content, and superconducting transition temperature in YBa2Cu3O7−δ
A. Hikata, M. J. McKenna, C. Elbaum, R. Kershaw, A. Wold
DOI 10.1103/PhysRevB.40.5247 · Physical Review B
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Abstract
We have examined the behavior of two-level-tunneling systems (TLS’s) in the high-temperature superconductor YBa2Cu3O7−δ as a function of decreasing oxygen content, by measuring the temperature dependence of ultrasonic-velocity changes at low temperatures, T≲1 K. We find the density of states of the TLS decreases with decreasing oxygen content and varies exponentially with both Tc and oxygen content. We interpret these results in light of recent measurements on oxygen-vacancy ordering in oxygen-deficient YBa2Cu3O7−δ. .AE
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | 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. | 83 | Pressure not reported | onset |
| YBa2Cu3O6.42 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | onset |
| YBa2Cu3O6.97 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | onset |
| YBa2Cu3O6.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | onset |
| YBa2Cu3O6.42 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 75 | Pressure not reported | onset |
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