Superconductivity-induced effect on “Raman-forbidden” modes in underdoped YBa2Cu3O7−x single crystals
A. G. Panfilov, M. F. Limonov, A. I. Rykov, S. Tajima, A. Yamanaka
DOI 10.1103/PhysRevB.57.R5634 · Physical Review B
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Abstract
A remarkable resonance-Raman effect has been observed for some “defect oxygen” modes in underdoped YBa2Cu3O7−x single crystals. In resonant conditions, we have studied the temperature dependence of frequencies for these originally Raman-forbidden modes as well as for the Raman-active ones. It has been found that, similar to the B1g-like mode, the yy-polarized “Raman-forbidden” modes soften below Tc, while the A1g-like modes dominating in the zz-polarized spectra do not. This difference in the phonon behaviors indicates a peculiarity of the interaction between the phonons and quasi-two-dimensional electron system in high-Tc superconductors. Above Tc, no clear phonon anomaly relevant to a pseudogap has been observed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 70 | Pressure not reported | unknown |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 66 | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
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