Temperature-Dependent Electronic Structure of the Colossal Magnetoresistive Manganite La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ via Hard X-Ray Photoemission

We have studied single-crystal La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ with hard x-ray photoemission (HXPS) at an excitation energy of 7.7 keV. These more bulk-sensitive measurements reveal low-binding-energy satellites in the Mn 2p$_{3/2}$, 3s, and 3p core spectra that are consistent with previously observed satellites in Mn 2p$_{3/2}$ for other strongly-correlated materials, and which have been interpreted in terms of non-localized screening effects. The Mn 3s spectrum is agreement with recent soft x-ray measurements (Mannella et al., P.R.L. \textbf{92}, 166401 (2004)) in showing an increased multiplet splitting at temperatures 100 K or more above T$_{C}$, although the effect is here reduced. Core-normalized valence-band spectra exhibit enhancement of intensity at high temperature that is evidence of localization of Mn 3d-derived charge, in agreement with prior soft x-ray work.