Temperature dependence of the far-infrared reflectivity spectrum of the high-Tc superconductor YBa2Cu3O7−y
J. M. Wrobel, S. Wang, S. Gygax, B. P. Clayman, L. K. Peterson
DOI 10.1103/PhysRevB.36.2368 · Physical Review B
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Abstract
The far-infrared spectrum of YBa2Cu3O7−y shows features not typical of a conventional superconductor. Besides rich phonon structure superimposed on a Drude-like tail, we find two regions of enhanced reflectivity below Tc. They begin at temperature-independent edges and each appears to be associated with a phononlike peak. These results could indicate temperature-independent energy gaps at 150 and 255 cm−1 or could be evidence of internal pair excitations strongly coupled to lattice modes. Also present are features suggestive of lattice modes which soften below Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.5 | Pressure not reported | midpoint |
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