Electronic Raman scattering of YBa2Cu3O7 using c-axis polarization: Evidence for two characteristic superconducting energies
K. F. McCarty, J. Z. Liu, R. N. Shelton, H. B. Radousky
DOI 10.1103/PhysRevB.42.9973 · Physical Review B
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Abstract
Raman scattering has been obtained with light polarized along the c axis of twin-free single crystals of YBa2Cu3O7. For c-axis polarization, an electronic continuum is observed, similar to the continuum observed for polarization within the a-b plane. In the superconducting state, there is a small decrease in the intensity of the c-axis continuum at energies below ∼200 cm−1. This change is not purely thermal in origin, since it occurs at essentially the same energy for temperatures between 4 and 65 K. This behavior differs from the large redistribution that occurs below Tc in the continuum observed for polarization within the a-b plane. If the characteristic energies for c-axis polarization (∼200 cm−1) and a-b polarization (400–500 cm−1) are interpreted as superconducting energy gaps, then there is either a single anisotropic gap or two gaps.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | onset |
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