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Pressure effects on transport as well as structural properties have been investigated for a bilayer manganite, La 2Ϫ2x Sr 1ϩ2x Mn 2 O 7 (xϭ0.48), near the phase boundary between the ferromagnetic metallic and the A-type antiferromagnetic states. An insulator-metal ͑IM͒ transition is found to be induced by applying pressure of ϳ0.7 GPa. On the basis of the synchrotron radiation x-ray structural analysis under high pressures, we have ascribed the IM transition to the variation of the stability ofdoi:10.1103/physrevb.62.17 fatcat:pg3mabzlqfet5og7xhpanppeeq