Soft X-ray Magnetic Circular Dichroism in La_<1-x>Sr_xMnO_3 and SrFe_<1-x>Co_xO_3

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We have studied the magnetic and electronic states of La_<1-x>Sr_xMnO_3 and SrFe_<1-x>Co_xO_3 by soft x-ray magnetic circular dichroism (SXMCD) measurements at the Mn, Fe and Co L_<2,3>, and the O K core-absorption edges. An application of the SXMCD orbital sum rule to the L_<2,3> SXMCD data clearly shows that the average orbital magneic moment (m_<orb>) of the nominal Mn^<3+> and Mn^<4+> ions is finite but small in La_<1-x>Sr_xMno_3, and that m_<orb> of the nominal Fe^<4+> ion is almost zero whereas m_<orb> of the nominal Co^<4+> ion is large in SrFe_<1-x>Co_xO_3. An SXMCD was also observed at the O K edge, showing spin polarzation of the O 2p state. These results provide evidence that the nominal Mn^<3+>, Mn^<4+>, Fe^<4+>, and Co^<4+> ions are dominantly in the highly charge-transferred d^5L__-, d^4L__-, d^5L__- and d^6L__- configurations, respectively, with L__- denoting the oxygen 2p hole.
社団法人日本磁気学会の論文
1999-01-20