Pressure-induced insulator-metal transition in a bilayer manganite: Pressure control of orbital stability

Y. Moritomo, K. Hirota, H. Nakao, T. Kiyama, Y. Murakami, S. Okamoto, S. Ishihara, S. Maekawa, M. Kubota, H. Yoshizawa
2000 Physical Review B (Condensed Matter)  
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 of
more » ... of the stability of the e g orbitals.
doi:10.1103/physrevb.62.17 fatcat:pg3mabzlqfet5og7xhpanppeeq