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Change in Mn 3d orbital state related to a metal-insulator transition in a bilayer manganite studied by magnetic Compton profile measurement

Temperature dependence of magnetic Compton profile (MCP) has been measured on a single crystal of La 2 - 2 x Sr 1 + 2 x Mn 2 O 7 at x=0.42 along the c-axis. The spin magnetic moments of Mn 3d electrons in t 2 g and e g type orbitals are evaluated from the line-shape fitting analysis of MCP's using theoretical profiles derived from the (MnO 6 ) 8 - ab initio calculations. The experimental ratios of eg spins to t 2 g ones show higher values above the metal-insulator transition temperature T c in comparison with the value expected from the electronically homogeneous state. This is understood in terms of the phase separation between electron-rich ferromagnetic and electron-poor antiferromagnetic regions. The ratios indicate that the eg electrons are highly segregated in the ferromagnetic region. In addition, the fitting result just above T c suggests that the eg-orbital state involved with the colossal magnetoresistance effect is optimized by an external magnetic field.