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No.4(pp.129-168)
Home > Issues > Volume 8 (2003) > No.4(pp.129-168)
 
X-ray Absorption and Photoemission Spectroscopy Study of Nd1/2A1/2Mn1-yCryO3 (A=Ca, Sr)
Journal of Magnetics, Volume 8, Number 4, 31 Dec 2003, Pages 142-145
J.S. Kang* (Department of Physics, The Catholic University of Korea), J. H. Kim(Department of Physics, The Catholic University of Korea), S. W. Han(Department of Physics, Gyeongsang National University), K. H. Kim(Department of Physics, Gyeongsang National University), E. J. Choi(Department of Physics, The University of Seoul), A. Sekiyama(Department of Material Physics, Graduate School of Engineering Science, Osaka University), S. Kasai(Department of Material Physics, Graduate School of Engineering Science, Osaka University), S. Suga(Department of Material Physics, Graduate School of Engineering Science, Osaka University), T. ura Kim(Department of Applied Physics, University of Tokyo)
Abstract
Valence states and electronic structures of Cr-doped Nd1/2A1/2Mn1-yCryO3 (NAMO; A=Ca, Sr) manganites have been investigated using x-ray absorption spectroscopy (XAS) and high-resolution photoemission spectroscopy (PES). All the Cr-doped NAMO systems exhibit the clear metallic Fermi edges in the Mn eg PES spectra near EF. The spectral intensity at EF is higher for Cr-doped Nd1/2Sr2MnO3 (NSMO) than for Cr-doped Nd1/2Ca/2MnO3 (NCMO), reflecting the stronger metallic nature for NSMO than for NCMO. The measured Cr 2p XAS spectra are found to be very similar to that of Cr2O3, indicating that Cr ions in Cr-doped NAMO are in the trivalent Cr3+ states (t32g). The Cr 2p XAS data are consistent with the Cr 3d PES spectra located at ∼1.3 eV below EF and having no emission near EF.
Keywords: photoemission; XAS; manganite; electronic structure
DOI:
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