Temperature-dependent electronic structure of the colossal magnetoresistive manganite La{sub 0.7}Sr{sub 0.3}MnO{sub 3} from hard x-ray photoemission.

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Phys. Rev. B

DOI:https://doi.org/10.1103/PhysRevB.77.174422· OSTI ID:938611

Offi, F; Mannella, N; Pardini, T; Panaccione, G; Fondacaro, A; Torelli, P; West, M W; Mitchell, J F; Fadley, C S; LBNL,; ESRF,

We have studied in situ fractured surfaces of single-crystal La{sub 0.7}Sr{sub 0.3}MnO{sub 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{sub 3/2}, 3s, and 3p core spectra that are in agreement with previously observed satellites in Mn 2p{sub 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.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 938611
• Report Number(s): ANL/MSD/JA-62542
• Journal Information: Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: 2008 Vol. 77; ISSN 1098-0121
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
ELECTRONIC STRUCTURE
LANTHANUM OXIDES
MAGNETORESISTANCE
MANGANESE OXIDES
STRONTIUM OXIDES