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We report a Raman scattering study of the pressure-induced collapse of theMott-like phases of Ca_3Ru_2O_7 (T_N=56 K) and Ca_2RuO_4 (T_N=110 K). Thepressure-dependence of the phonon and two-magnon excitations in these materialsindicate: (i) a pressure-induced collapse of the antiferromagnetic (AF)insulating phase above P* ~ 55 kbar in Ca_3Ru_2O_7 and P* ~ 5-10 kbar inCa_2RuO_4, reflecting the importance of Ru-O octahedral distortions instabilizing the AF insulating phase; and (ii) evidence for persistent AFcorrelations above the critical pressure of Ca_2RuO_4, suggestive of phaseseparation involving AF insulator and ferromagnetic metal phases.Comment: 3 figure

physical review letters

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