Synchrotron-radiation spectroscopy of electron- and hole-doped collossal magneto-resistance double perovskites: BxA2−xFeMoO6 (A=Ba,Sr;B=La,K)
作者： G. Kim , S. S. Lee , S. C. Wi , J.-S. Kang , S. W. Han
DOI: 10.1063/1.2165134
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摘要: The electronic structures of BxA2−xFeMoO6 (A=Ba,Sr;B=La,K) double perovskites have been investigated by using photoemission spectroscopy and soft-x-ray absorption (XAS) near the Fe 2p O 1s edges. XAS spectra undoped A2FeMoO6 (A=Ba,Sr) provide evidence for mixed-valent Fe2+–Fe3+ states. substitution La3+ K+ ions A2+ causes increasing Fe3+ component Fe2+ component, respectively. states close to Fermi level mainly Mo–Fe t2g(↓) character, consistent with As amount increases in KxSr2−xFeMoO6, intensity decreases, reflecting decreasing carriers bandwidth itinerant
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