Temperature-dependent electronic structure of the colossal magnetoresistive manganite La(0.7)Sr(0.3)MnO(3) from hard x-ray photoemission

We have studied in situ fractured surfaces of single-crystal La(0.7)S(10.3)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 in agreement with previously observed satellites in Mn 2p(3/2) for other strongly correlated materials, and which have been interpreted in terms of nonlocalized screening effects. The Mn 3s spectrum is consistent with recent soft x-ray measurements [N. Mannella et al., Phys. Rev. Lett. 92, 166401 (2004)] in showing an increased multiplet splitting at temperatures 100 K or more above the Curie temperature, although the magnitude of the effect is somewhat reduced. The valence-band spectra exhibit significant enhancement of intensity at such higher temperatures that we interpret as evidence of localization of Mn 3d-derived charge, which is in agreement with the multiplet splitting change and prior soft x-ray work. Additional aspects of HXPS for the study of complex materials are thus demonstrated.