Resonant photoemission spectroscopy study of insulator-to-metal transition in Cr- and Ru-doped Nd₁/₂A₁/₂Mn₁₋y O₃ (A=Ca, Sr)
Kang, J. -S. · Kim, J. H. · Sekiyama, A. · Kasai, S. · Suga, S. · Han, S. W. · Kim, K. H. · Choi, E. J. · Kimura, T. · Muro, T. · Saitoh, Y. · Olson, C. G. · Shim, J. H. · Min, B. I.
Original · EN
Electronic structures of very dilute Cr- or Ru-doped Nd₁/₂A₁/₂MnO₃ (NAMO; A=Ca, Sr) manganites have been investigated using the Mn and Cr 2p -> 3d resonant photoemission spectroscopy (PES). All the Cr- and Ru-doped NAMO systems exhibit the clear metallic Fermi edges in the Mn eg spectra near EF, consistent with their metallic ground states. The Cr 3d states with t³₂g configuration are at 1.3 eV below EF, and the Cr eg states do not participate in the formation of the band near EF. Cr- and Ru-induced ferromagnetism and insulator-to-metal transitions can be understood with their measured electronic structures.
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