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X-ray magnetic circular dichroism (XMCD) at the Eu L-edge (2p->5d) in twocompounds exhibiting valence fluctuation, namely EuNi2(Si0.18Ge0.82)2 andEuNi2P2, has been investigated at pulsed high magnetic fields of up to 40 T. Adistinct XMCD peak corresponding to the trivalent state (Eu3+; f6), whoseground state is nonmagnetic (J=0), was observed in addition to the main XMCDpeak corresponding to the magnetic (J=7/2) divalent state (Eu2+; f7). Thisresult indicates that the 5d electrons belonging to both valence states aremagnetically polarized. It was also found that the ratio P5d(3+)/P5d(2+)between the polarization of 5d electrons (P5d) in the Eu3+ state and that ofEu2+ is ~ 0.1 in EuNi2(Si0.18Ge0.82)2 and ~ 0.3 in EuNi2P2 at magnetic fieldswhere their macroscopic magnetization values are the same. The possible originof the XMCD of the Eu3+ state and an explanation of the dependence ofP5d(3+)/P5d(2+) on the material are discussed in terms of hybridization betweenthe conduction electrons and the f electrons.

X-Ray Magnetic Circular Dichroism of a Valence Fluctuating State in Eu at High Magnetic Fields