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We report on a high-pressure Raman study on two members of theLa$_{1-x}$Ca$_x$MnO$_{3-\delta}$ manganite family ($x=0.20$, $\delta=0$ and$\delta=0.08$). The results obtained for the $\delta=0$ sample show a differentbehavior in the low and high pressure regimes ascribed to the onset of a newpressure-activated interaction previously invoked in other manganite compounds.The comparison of our results with literature data gives further support to theidentification of the Jahn-Teller active stretching mode and shows thatpressure-induced octahedral symmetrization is more effective in systemsexhibiting a lower metallic character. On the contrary the new interaction setsin at pressure which decreases on increasing the metallic character of thesystem indicating a relevant role of the Mn-Mn hopping integral in itsactivation.

High pressure Raman study of La$_{1-x}$Ca$_x$MnO$_{3-\delta}$ manganites