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Pressure effects on transport as well as structural properties have been investigated for a bilayer manganite, La_2-2xSr₁₊₂ₓMn₂O₇ $(x=0.48),$ near the phase boundary between the ferromagnetic metallic and the A-type antiferromagnetic states. An insulator-metal (IM) transition is found to be induced by applying pressure of ~0.7 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 of the eg orbitals.
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Moritomo et al. (2000) studied this question.
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