Raman study of the anomalous behavior of the 340-cm−1 CuO2 planar-oxygen phonon in Ni-doped YBa2Cu3O7−δ superconducting films
Kyung-Min Ham, Jin-Tae Kim, R. Sooryakumar, Thomas R. Lemberger
DOI 10.1103/PhysRevB.47.11439 · Physical Review B
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Abstract
The unusual softening of the B1g-like phonon of YBa2Cu3O7 is studied as a function of Tc by substituting up to 6% nickel for Cu. The abrupt onset and small temperature range over which the softening occurs in undoped YBa2Cu3O7 are modified upon doping with the softening occurring well above Tc and continuing smoothly to 10 K when Tc is reduced to 71 K. The phonon linewidth in the doped films shows no anomalies, regardless of Ni concentration. In contrast, the self-energies of the Ag modes associated with the plane copper [Cu(2)] and bridging oxygen (O4) atoms reveal normal thermal behavior for all films. We conclude that an additional mechanism, besides strong coupling of phonons to superconducting electrons, contributes to the B1g-phonon anomalies.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure unresolved | onset |
| YBa2(Cu1-xNix)3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 71 | Pressure unresolved | onset |
| YBa2Cu4O8 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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