Valence state of Mn in La1−xSrxMnO3 probed by resonant Mn 3s→2p x-ray emission spectroscopy

Mn 3→2 xray emission spectrum is measured at the Mn 21/2 photoabsorption maximum around 653 eV for polycrystalline La1−SrMnO3 with  from 0 to 1. A doublepeak structure like the exchange splitting in the Mn 3 corelevel photoemission spectrum is observed in the Mn 3→21/2 emission spectrum. With increasing , the splitting energy of the doublepeak in the emission is nearly constant up to around = 0.5 and then decreases until = 1. This is consistent with the dependence of the Mn 3 electron number in doped manganite estimated in previous studies. It indicates that the splitting energy in the emission measures the Mn 3 spin moment or the Mn valence state of manganites. The probing depth of the method is about 100 nm.