Raman investigation of the superconducting gap of YBa2Cu3Ox for 6.85<x<7.0
E. Altendorf, J. C. Irwin, R. Liang, W. N. Hardy
DOI 10.1103/PhysRevB.45.7551 · Physical Review B
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Abstract
The temperature dependences of the linewidth and frequency of the 340-cm−1 Raman-active phonon have been measured in five lightly twinned crystals of YBa2Cu3Ox with different oxygen concentrations x. The observed changes in the linewidth and frequency that occur for temperatures below the critical temperature have been found to depend strongly on the value of x within the region 6.85≲x≲7.0. The linewidth and frequency dependences for T<Tc result in superconducting gap energy estimates which indicate that 2Δ decreases for oxygen concentration x>6.95 and remains aproximately constant for 6.85≲x≲6.95. Given the low level of impurities in these crystals these results are attributed to variations in the hole concentrations which arise primarily from variations in the oxygen content.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93.7 | Pressure not reported | onset |
| YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.5 | Pressure not reported | onset |
| YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | onset |
| YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | onset |
| YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89.8 | Pressure not reported | onset |
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