Hydrostatic-pressure-induced phase separation in the YBa2Cu4O8 superconductor
D. Lampakis, D. Palles, E. Liarokapis, S. M. Kazakov, J. Karpinski
DOI 10.1103/PhysRevB.72.014539 · Physical Review B
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Abstract
A micro-Raman study under high hydrostatic pressure (up to ∼7.5GPa) has been carried out on YBa2Cu4O8 superconducting single crystals at room and low temperatures down to 77K. Seven strong modes of Ag symmetry, two of weak B2g and B3g symmetry, and another mode at ∼431cm−1 have been investigated. With increasing hydrostatic pressure the first nine phonons shift to higher energies while the latter is independent of pressure. A splitting of the mode attributed to the in-phase vibrations of the plane O oxygen atoms has been observed. Besides, anomalous nonlinear pressure behavior has been observed for the other Ag phonons, which is correlated with the splitting of the in-phase mode and the pressure dependence of the superconducting transition temperature of this compound. The results indicate a pressure-induced phase separation, which is related with a lattice distortion from the tilting of the CuO6 octahedra.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure unresolved | unknown |
| YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure unresolved | unknown |
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 104 | 6.2 GPa | unknown |
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