Superconducting gap anisotropy and phonon anomalies in single crystal NdBa2Cu3O7−x
O. V. Misochko, K. Kuroda, N. Koshizuka
DOI 10.1103/PhysRevB.56.9116 · Physical Review B
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Abstract
The temperature dependence of the low-frequency part of electronic Raman scattering was investigated in single crystal NdBa2Cu3O7−x with light polarized within the CuO2 planes and along the c axis. From the electronic continuum redistribution below Tc, the pair-breaking energy is derived and is shown to depend on polarization. The in-plane pair-breaking 2Δ peaks are located at 330 cm−1 for the A1g symmetry and around 580 cm−1 for B1g. If we assume that the pair-breaking peak position is a measure of the superconducting gap, these values are almost the same, as in YBa2Cu3O7−x, 2Δ/Tc ratios being roughly 5.2 and 8.5. For the c-axis response we detect the pair-breaking peak between 400 and 500 cm−1 and there is also a small decrease in the intensity at frequencies below 200 cm−1. We also discuss some phonon anomalies probably caused by the substitution of Ba2+ by Nd3+.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NdBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | unknown |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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