Dynamics of low-frequency phonons in the YBa2Cu3O7−x superconductor studied by time- and frequency-domain spectroscopies
O. V. Misochko, K. Kisoda, K. Sakai, S. Nakashima
DOI 10.1103/PhysRevB.61.4305 · Physical Review B
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Abstract
We have investigated the temperature dependence of the optical reflectivity at femtosecond scale in YBa2Cu3O7−x superconductors. In both normal and superconducting states, we detect the oscillations associated with two A1g metal-ion modes and compare the phonon dynamics to those obtained by frequency-domain (Raman) spectroscopy. Apart from the considerable increase of amplitude for low-frequency mode in the superconducting state, we observe that its initial phase in the time domain is approximately π/4 shifted by the superconductivity, whereas for the high-frequency mode the initial phase shift is almost two times larger. Even though similar lattice anomalies are observed in both time and frequency domains, the systematic analysis shows that the coherent lattice dynamics is different from the ordinary (thermal state) dynamics probed by frequency-domain spectroscopy.
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. | 87 | Pressure not reported | unknown |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | unknown |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | unknown |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | unknown |
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