Abstract
In this work, a micro-Raman study under high hydrostatic pressure (up to ∼5.5 GPa) has been carried on YBa2Cu4O8 and Y(Ba, Sr)2Cu4O8 single crystals at room temperature. In both samples, seven strong modes, of Ag symmetry, and one weak, of B3g symmetry, have been observed and examined in connection with previously published results concerning YBa2Cu4O8. With the Sr substitution for Ba, the ambient pressure measurements show an upward shift in energy for all modes, except those that involve vibrations of the plane and apex oxygen atoms. With increasing hydrostatic pressure all phonons shift to higher energies. Anomalous nonlinear pressure behaviour has been observed for three phonons, which is correlated with the pressure dependence of T c of these compounds.
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