Pressure-Tuned Collapse of the Mott-Like State in Can+1RunO3n+1 (n=1,2): Raman Spectroscopic Studies
Abstract
We report a Raman scattering study of the pressure-induced collapse of the Mott-like phases of Ca3Ru2O7 (TN=56 K) and Ca2RuO4 (TN=110 K). The pressure-dependence of the phonon and two-magnon excitations in these materials indicate: (i) a pressure-induced collapse of the antiferromagnetic (AF) insulating phase above P* ~ 55 kbar in Ca3Ru2O7 and P* ~ 5-10 kbar in Ca2RuO4, reflecting the importance of Ru-O octahedral distortions in stabilizing the AF insulating phase; and (ii) evidence for persistent AF correlations above the critical pressure of Ca2RuO4, suggestive of phase separation involving AF insulator and ferromagnetic metal phases.
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